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Mails time before queue manager

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  • KK Patnaik
    Hi, I am having issue with my SMTP servers where the mails are taking long time before the queue manager. Mar 20 10:43:55 smtp2 postfix/smtp[13548]:
    Message 1 of 23 , Mar 20, 2014

      Hi,

       

      I am having issue with my SMTP servers where the mails are taking long time before the queue manager.

       

      Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D: to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25, delay=29217, delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250 2.0.0 OK 1395326635 ac8si2519638icc.108 - gsmtp

       

      Output of postconf –n

      ---------------------------------------

      alias_database = hash:/etc/aliases

      alias_maps = hash:/etc/aliases

      bounce_queue_lifetime = 0

      broken_sasl_auth_clients = yes

      command_directory = /usr/sbin

      config_directory = /etc/postfix

      daemon_directory = /usr/libexec/postfix

      debug_peer_level = 2

      html_directory = no

      inet_interfaces = all

      local_recipient_maps =

      mail_owner = postfix

      mailq_path = /usr/bin/mailq.postfix

      manpage_directory = /usr/share/man

      maximal_queue_lifetime = 0

      message_size_limit = 50240000

      mydestination = $myhostname, localhost.$mydomain, localhost

      mydomain = smtp2.oursmtpmail.com

      myhostname = smtp2.oursmtpmail.com

      newaliases_path = /usr/bin/newaliases.postfix

      non_smtpd_milters = unix:/var/run/dkim-milter/dkim-milter.sock, unix:/var/run/dk-milter/dk-milter.sock

      notify_classes = bounce, delay, resource

      queue_directory = /var/spool/postfix

      queue_run_delay = 2m

      readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES

      sample_directory = /usr/share/doc/postfix-2.3.3/samples

      sendmail_path = /usr/sbin/sendmail.postfix

      setgid_group = postdrop

      smtpd_banner = smtp2.oursmtpmail.com

      smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unknown_sender_domain

      smtpd_delay_reject = no

      smtpd_error_sleep_time = 1s

      smtpd_hard_error_limit = 20

      smtpd_milters = unix:/var/run/dkim-milter/dkim-milter.sock, unix:/var/run/dk-milter/dk-milter.sock

      smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination

      smtpd_reject_unlisted_sender = yes

      smtpd_sasl_auth_enable = yes

      smtpd_sasl_path = private/auth

      smtpd_sasl_security_options = noanonymous

      smtpd_sasl_type = dovecot

      smtpd_soft_error_limit = 10

      transport_maps = hash:/etc/postfix/transport

      unknown_local_recipient_reject_code = 550

      virtual_alias_maps = hash:/etc/postfix/virtual

      virtual_mailbox_limit = 102400000

      --------------------------------

       

      Please advise on how to resolve this.

    • Wietse Venema
      ... What is the output from: $ grep 25142124292D /the/maillog/file Wietse
      Message 2 of 23 , Mar 20, 2014
        KK Patnaik:
        > I am having issue with my SMTP servers where the mails are taking long time
        > before the queue manager.
        >
        > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D: to=<sam@...>,
        > relay=aspmx.l.google.com[74.125.142.26]:25, delay=29217,
        > delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250 2.0.0 OK 1395326635
        > ac8si2519638icc.108 - gsmtp

        What is the output from:

        $ grep 25142124292D /the/maillog/file

        Wietse
      • Viktor Dukhovni
        ... http://www.postfix.org/QSHAPE_README.html http://www.postfix.org/TUNING_README.html ... Is this a bounce? Or a regular outbound message. With congested
        Message 3 of 23 , Mar 20, 2014
          On Thu, Mar 20, 2014 at 09:26:12PM +0530, KK Patnaik wrote:

          > I am having issue with my SMTP servers where the mails are taking long time
          > before the queue manager.

          http://www.postfix.org/QSHAPE_README.html
          http://www.postfix.org/TUNING_README.html

          > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D: to=<sam@...>,
          > relay=aspmx.l.google.com[74.125.142.26]:25, delay=29217,
          > delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250 2.0.0 OK 1395326635
          > ac8si2519638icc.108 - gsmtp

          Is this a bounce? Or a regular outbound message. With congested queues,
          a single log entry is not that interesting, you need to understand the
          average behaviour of the queue. You MUST analyze your logs.

          - Where is most mail coming from?
          - At what rate?
          - Where is mail going?
          - At what rate?
          - What is the typical delivery latency (c+d in delays=a/b/c/d)?
          - Are you generating bounces? Too many postmaster notices?
          - ...

          Understand what your system is doing, then ask for help.

          > bounce_queue_lifetime = 0
          > maximal_queue_lifetime = 0

          These are rather unwise. Why have you disabled delivery retries?

          > mydomain = smtp2.oursmtpmail.com
          > myhostname = smtp2.oursmtpmail.com
          > mydestination = $myhostname, localhost.$mydomain, localhost
          > local_recipient_maps =

          Why have you disabled recipient validation? You accept and then
          bounce mail to invalid recipients, this congests your queue.

          Consider setting:

          # Empty, default is (effectively sub-domains of) $mydestination
          relay_domains =

          > notify_classes = bounce, delay, resource

          On a congested mailserver, you're far better off setting:

          # empty
          notify_classes =

          and monitor logs instead.

          > smtpd_delay_reject = no
          >
          > smtpd_client_restrictions =
          > permit_mynetworks, permit_sasl_authenticated,
          > reject_unauth_destination, reject_unknown_sender_domain
          >

          With "smtpd_delay_reject = no", there is no login, recipient or sender
          information at connect time, so this setting is pointless.

          > smtpd_recipient_restrictions =
          > permit_mynetworks,
          > permit_sasl_authenticated,
          > reject_unauth_destination

          An RBL or two might help.

          > smtpd_reject_unlisted_sender = yes

          There are no unlisted senders, because local_recipient_maps is
          empty, and you have no virtual_mailbox_domains.

          --
          Viktor.
        • KK Patnaik
          Mar 20 10:06:59 smtp2 postfix/smtpd[9007]: 25142124292D: client=mm3. oursmtpmail.com[xx.xx.xx.xx], sasl_method=LOGIN, sasl_username=2smtp Mar 20 10:06:59 smtp2
          Message 4 of 23 , Mar 21, 2014
            Mar 20 10:06:59 smtp2 postfix/smtpd[9007]: 25142124292D: client=mm3.
            oursmtpmail.com[xx.xx.xx.xx], sasl_method=LOGIN, sasl_username=2smtp
            Mar 20 10:06:59 smtp2 postfix/cleanup[10918]: 25142124292D:
            message-id=<20140320140659.25142124292D@smtp2. oursmtpmail.com>
            Mar 20 10:19:52 smtp2 postfix/qmgr[7470]: 25142124292D:
            from=<UEMLMM1_87001230297055@...>, size=58126, nrcpt=1 (queue
            active)
            Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D: to=<sam@...>,
            relay=aspmx.l.google.com[74.125.142.26]:25, delay=2217,
            delays=775/1441/0.14/1.4, dsn=2.0.0, status=sent (250 2.0.0 OK 1395326635
            ac8si2519638icc.108 - gsmtp)
            Mar 20 10:43:55 smtp2 postfix/qmgr[7470]: 25142124292D: removed

            -----Original Message-----
            From: owner-postfix-users@...
            [mailto:owner-postfix-users@...] On Behalf Of Wietse Venema
            Sent: Thursday, March 20, 2014 9:51 PM
            To: Postfix users
            Subject: Re: Mails time before queue manager

            KK Patnaik:
            > I am having issue with my SMTP servers where the mails are taking long
            > time before the queue manager.
            >
            > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
            > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
            > delay=29217, delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
            > 2.0.0 OK 1395326635
            > ac8si2519638icc.108 - gsmtp

            What is the output from:

            $ grep 25142124292D /the/maillog/file

            Wietse
          • Wietse Venema
            ... Here, the message is in the queue for 29217 seconds. ... This message has been in the queue for 2217 seconds, which is consistent with arrival at 10:06:59
            Message 5 of 23 , Mar 21, 2014
              KK Patnaik:
              > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
              > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
              > delay=29217, delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
              > 2.0.0 OK 1395326635
              > ac8si2519638icc.108 - gsmtp

              Here, the message is in the queue for 29217 seconds.

              Wietse:
              > What is the output from:
              > $ grep 25142124292D /the/maillog/file

              KK Patnaik:
              > Mar 20 10:06:59 smtp2 postfix/smtpd[9007]: 25142124292D: client=mm3.
              > oursmtpmail.com[xx.xx.xx.xx], sasl_method=LOGIN, sasl_username=2smtp
              ...
              > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
              > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
              > delay=2217, delays=775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
              > 2.0.0 OK 1395326635
              > ac8si2519638icc.108 - gsmtp)

              This message has been in the queue for 2217 seconds, which is
              consistent with arrival at 10:06:59 and delivery at 10:43:55.

              Why did you report (see top of this message) that this message
              was queued for 29217 seconds?

              Wietse
            • KK Patnaik
              Most of the messages are staying in the queue for such long time and that is delaying the delivery of the mail to the recipient. ... From:
              Message 6 of 23 , Mar 21, 2014
                Most of the messages are staying in the queue for such long time and that is
                delaying the delivery of the mail to the recipient.

                -----Original Message-----
                From: owner-postfix-users@...
                [mailto:owner-postfix-users@...] On Behalf Of Wietse Venema
                Sent: Friday, March 21, 2014 5:18 PM
                To: Postfix users
                Subject: Re: Mails time before queue manager

                KK Patnaik:
                > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                > delay=29217, delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                > 2.0.0 OK 1395326635
                > ac8si2519638icc.108 - gsmtp

                Here, the message is in the queue for 29217 seconds.

                Wietse:
                > What is the output from:
                > $ grep 25142124292D /the/maillog/file

                KK Patnaik:
                > Mar 20 10:06:59 smtp2 postfix/smtpd[9007]: 25142124292D: client=mm3.
                > oursmtpmail.com[xx.xx.xx.xx], sasl_method=LOGIN, sasl_username=2smtp
                ...
                > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                > delay=2217, delays=775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                > 2.0.0 OK 1395326635
                > ac8si2519638icc.108 - gsmtp)

                This message has been in the queue for 2217 seconds, which is consistent
                with arrival at 10:06:59 and delivery at 10:43:55.

                Why did you report (see top of this message) that this message was queued
                for 29217 seconds?

                Wietse
              • Wietse Venema
                ... So you just added 29 thousand seconds of delay by hand. You just wasted my time with false evidence. Goodbye. Wietse
                Message 7 of 23 , Mar 21, 2014
                  KK Patnaik:
                  > Most of the messages are staying in the queue for such long time and that is
                  > delaying the delivery of the mail to the recipient.

                  So you just added 29 thousand seconds of delay by hand.
                  You just wasted my time with false evidence. Goodbye.

                  Wietse

                  > -----Original Message-----
                  > From: owner-postfix-users@...
                  > [mailto:owner-postfix-users@...] On Behalf Of Wietse Venema
                  > Sent: Friday, March 21, 2014 5:18 PM
                  > To: Postfix users
                  > Subject: Re: Mails time before queue manager
                  >
                  > KK Patnaik:
                  > > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                  > > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                  > > delay=29217, delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                  > > 2.0.0 OK 1395326635
                  > > ac8si2519638icc.108 - gsmtp
                  >
                  > Here, the message is in the queue for 29217 seconds.
                  >
                  > Wietse:
                  > > What is the output from:
                  > > $ grep 25142124292D /the/maillog/file
                  >
                  > KK Patnaik:
                  > > Mar 20 10:06:59 smtp2 postfix/smtpd[9007]: 25142124292D: client=mm3.
                  > > oursmtpmail.com[xx.xx.xx.xx], sasl_method=LOGIN, sasl_username=2smtp
                  > ...
                  > > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                  > > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                  > > delay=2217, delays=775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                  > > 2.0.0 OK 1395326635
                  > > ac8si2519638icc.108 - gsmtp)
                  >
                  > This message has been in the queue for 2217 seconds, which is consistent
                  > with arrival at 10:06:59 and delivery at 10:43:55.
                  >
                  > Why did you report (see top of this message) that this message was queued
                  > for 29217 seconds?
                  >
                  > Wietse
                  >
                  >
                • KK Patnaik
                  No I didn t add anything. There are lot of logs like that in my server. I am just trying to resolve the delay of the emails. Please advise. ... From:
                  Message 8 of 23 , Mar 21, 2014
                    No I didn't add anything. There are lot of logs like that in my server. I am
                    just trying to resolve the delay of the emails. Please advise.

                    -----Original Message-----
                    From: owner-postfix-users@...
                    [mailto:owner-postfix-users@...] On Behalf Of Wietse Venema
                    Sent: Friday, March 21, 2014 8:06 PM
                    To: Postfix users
                    Subject: Re: Mails time before queue manager

                    KK Patnaik:
                    > Most of the messages are staying in the queue for such long time and
                    > that is delaying the delivery of the mail to the recipient.

                    So you just added 29 thousand seconds of delay by hand.
                    You just wasted my time with false evidence. Goodbye.

                    Wietse

                    > -----Original Message-----
                    > From: owner-postfix-users@...
                    > [mailto:owner-postfix-users@...] On Behalf Of Wietse Venema
                    > Sent: Friday, March 21, 2014 5:18 PM
                    > To: Postfix users
                    > Subject: Re: Mails time before queue manager
                    >
                    > KK Patnaik:
                    > > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                    > > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                    > > delay=29217, delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                    > > 2.0.0 OK 1395326635
                    > > ac8si2519638icc.108 - gsmtp
                    >
                    > Here, the message is in the queue for 29217 seconds.
                    >
                    > Wietse:
                    > > What is the output from:
                    > > $ grep 25142124292D /the/maillog/file
                    >
                    > KK Patnaik:
                    > > Mar 20 10:06:59 smtp2 postfix/smtpd[9007]: 25142124292D: client=mm3.
                    > > oursmtpmail.com[xx.xx.xx.xx], sasl_method=LOGIN, sasl_username=2smtp
                    > ...
                    > > Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                    > > to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                    > > delay=2217, delays=775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                    > > 2.0.0 OK 1395326635
                    > > ac8si2519638icc.108 - gsmtp)
                    >
                    > This message has been in the queue for 2217 seconds, which is
                    > consistent with arrival at 10:06:59 and delivery at 10:43:55.
                    >
                    > Why did you report (see top of this message) that this message was
                    > queued for 29217 seconds?
                    >
                    > Wietse
                    >
                    >
                  • Larry Stone
                    ... Please do not top-post on this mailing list. ... You are either deliberately lying or you are in so far over your head that you have no business being
                    Message 9 of 23 , Mar 21, 2014
                      On Sat, 22 Mar 2014, KK Patnaik wrote:

                      > No I didn't add anything. There are lot of logs like that in my server. I am
                      > just trying to resolve the delay of the emails. Please advise.

                      Please do not top-post on this mailing list.

                      >> KK Patnaik:
                      >>> Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                      >>> to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                      >>> delay=29217, delays=29775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                      >>> 2.0.0 OK 1395326635
                      >>> ac8si2519638icc.108 - gsmtp


                      >>> Mar 20 10:43:55 smtp2 postfix/smtp[13548]: 25142124292D:
                      >>> to=<sam@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                      >>> delay=2217, delays=775/1441/0.14/1.4, dsn=2.0.0, status=sent (250
                      >>> 2.0.0 OK 1395326635
                      >>> ac8si2519638icc.108 - gsmtp)

                      You are either deliberately lying or you are in so far over your head that
                      you have no business being anywhere near any computer as an administrator.

                      Do you not see that two log excertps above, both sent by you, are the same
                      except that the delays in the first one have been changed from 2217 to
                      29217 and from 775 to 29775? The first (which was what you sent
                      originally) is obviously doctored as the delay componenents do not equal
                      the total delay (29775 is greater than 29217 so even before getting to the
                      last three delay components, it's obviously bogus).

                      As Wietse said, you've wasted our time. And if you don't know who Wietse
                      is, I suggest you do a search on his name before posting here again.

                      -- Larry Stone
                      lstone19@...
                    • Viktor Dukhovni
                      ... While the OP is not helping by modifying the very information that could be used to solve his problem, the above is taking the admonition way to far.
                      Message 10 of 23 , Mar 21, 2014
                        On Fri, Mar 21, 2014 at 03:25:58PM -0500, Larry Stone wrote:

                        > You are either deliberately lying or you are in so far over your head that
                        > you have no business being anywhere near any computer as an administrator.

                        While the OP is not helping by modifying the very information that
                        could be used to solve his problem, the above is taking the admonition
                        way to far. Please apologize and try to stay calm.

                        The OP needs to analyze his logs as a body of data, not single
                        points. One message does not create congestion, which is a result
                        of many messages.

                        Therefore, in addition to employing the tools described in
                        QSHAPE_README, the OP needs to disclose any relevant configuration
                        settings, in particular any rate limited transports, non-default
                        concurrency settings, ...

                        What's critical is to understand where most of the mail is going,
                        whether there are any DNS misconfiguration issues slowing down MX
                        resolution, ... The message input rates and output rates need to
                        be measured and compared. Also the mean "c+d" value needs to be
                        computed to determine whether there is sufficient output concurrency
                        to deliver the input rate.

                        Notification settings need to be adjusted to reduce congestion from
                        notices about congestion, and recipient validation MUST be enabled
                        properly.

                        --
                        Viktor.
                      • Larry Stone
                        ... I m calm. But I apologize for the apparent tone of my reply. -- Larry Stone lstone19@stonejongleux.com
                        Message 11 of 23 , Mar 21, 2014
                          On Fri, 21 Mar 2014, Viktor Dukhovni wrote:

                          > While the OP is not helping by modifying the very information that
                          > could be used to solve his problem, the above is taking the admonition
                          > way to far. Please apologize and try to stay calm.

                          I'm calm. But I apologize for the apparent tone of my reply.

                          -- Larry Stone
                          lstone19@...
                        • KK Patnaik
                          Please find my actual logs for the delays only. Please advise on how to handle this. I need to see that the delivery doesn t slow down because in this rate the
                          Message 12 of 23 , Mar 25, 2014
                            Please find my actual logs for the delays only. Please advise on how to
                            handle this. I need to see that the delivery doesn't slow down because in
                            this rate the emails are delivered after around 3-4hours.

                            [root@smtp9 ~]# tail -f /var/log/maillog | grep delays
                            Mar 24 13:58:33 smtp9 postfix/smtp[41918]: BC419297520:
                            to=<sohaib@...>, relay=ASPMX.L.GOOGLE.com[74.125.142.26]:25,
                            delay=8382, delays=8303/78/0.12/0.72, dsn=2.0.0, status=sent (250 2.0.0 OK
                            1395770359 j5si28607068igj.39 - gsmtp)
                            Mar 24 13:58:33 smtp9 postfix/smtp[41638]: 3295D299F17:
                            to=<hgirgis@...>, relay=barr01.krns-inc.com[69.43.181.38]:25,
                            delay=3937, delays=3857/79/0.22/0.95, dsn=2.0.0, status=sent (250 Ok: queued
                            as CE7B791043)
                            Mar 24 13:58:33 smtp9 postfix/error[41901]: B632CF2948D:
                            to=<indrani@...>, relay=none, delay=94251,
                            delays=94251/0.03/0/0.09, dsn=4.4.3, status=deferred (delivery temporarily
                            suspended: Host or domain name not found. Name service error for
                            name=softpros.com type=MX: Host not found, try again)
                            Mar 24 13:58:34 smtp9 postfix/error[41880]: B8A8D2A445C:
                            to=<btalwar@...>, relay=none, delay=87344,
                            delays=87344/0.1/0/0.12, dsn=4.4.1, status=deferred (delivery temporarily
                            suspended: connect to techpeople.com[199.59.243.107]:25: Connection timed
                            out)
                            Mar 24 13:58:34 smtp9 postfix/smtp[41918]: BBCC12A26EC:
                            to=<sulabh@...>,
                            relay=ALT1.ASPMX.L.GOOGLE.com[173.194.68.26]:25, delay=87726,
                            delays=87647/78/0.52/0.08, dsn=4.2.2, status=deferred (host
                            ALT1.ASPMX.L.GOOGLE.com[173.194.68.26] said: 452-4.2.2 The email account
                            that you tried to reach is over quota. Please direct 452-4.2.2 the recipient
                            to 452 4.2.2 http://support.google.com/mail/bin/answer.py?answer=6558
                            u15si11052933qge.3 - gsmtp (in reply to RCPT TO command))
                            Mar 24 13:58:34 smtp9 postfix/smtp[41212]: B4DA7298D3C:
                            to=<tania@...>, relay=none, delay=7953, delays=7852/81/20/0,
                            dsn=4.4.3, status=deferred (Host or domain name not found. Name service
                            error for name=ravebsi.com type=MX: Host not found, try again)
                            Mar 24 13:58:34 smtp9 postfix/error[41891]: B53FBF28174:
                            to=<steve@...>, relay=none, delay=99163, delays=99163/0.05/0/0.23,
                            dsn=4.4.3, status=deferred (delivery temporarily suspended: Host or domain
                            name not found. Name service error for name=iqinc.com type=MX: Host not
                            found, try again)
                            Mar 24 13:58:34 smtp9 postfix/smtp[41526]: BAF70288F50:
                            to=<faisal@...>, relay=none, delay=81540, delays=81433/77/30/0,
                            dsn=4.4.1, status=deferred (connect to jobaccord.com[207.189.109.121]:25:
                            Connection timed out)
                            Mar 24 13:58:34 smtp9 postfix/smtp[41212]: B10BF29F6A9:
                            to=<dutt@...>, relay=none, delay=5877, delays=5798/79/0.39/0,
                            dsn=4.4.1, status=deferred (connect to win-sys.com[219.94.217.210]:25:
                            Connection refused)
                            Mar 24 13:58:35 smtp9 postfix/smtp[41510]: B431DD698F0:
                            to=<satya.m@...>, relay=none, delay=93923,
                            delays=93823/80/20/0, dsn=4.4.3, status=deferred (Host or domain name not
                            found. Name service error for name=capsinnovative.com type=MX: Host not
                            found, try again)
                            Mar 24 13:58:35 smtp9 postfix/smtp[41490]: 08796295060:
                            to=<sg_sangam@...>,
                            relay=mx2.sbcglobal.am0.yahoodns.net[98.138.206.39]:25, delay=9052,
                            delays=8973/78/0.13/1.2, dsn=2.0.0, status=sent (250 ok dirdel)
                            Mar 24 13:58:35 smtp9 postfix/error[41882]: BC864DA9F92:
                            to=<mac@...>, relay=none, delay=352755,
                            delays=352755/0.11/0/0.13, dsn=4.4.1, status=deferred (delivery temporarily
                            suspended: connect to globaltek-inc.com[208.73.211.164]:25: Connection timed
                            out)
                            Mar 24 13:58:35 smtp9 postfix/error[41879]: A0F4528EAC0:
                            to=<prakash@...>, relay=none, delay=10813, delays=10812/0.09/0/0.06,
                            dsn=4.4.3, status=deferred (delivery temporarily suspended: Host or domain
                            name not found. Name service error for name=psdinc.com type=MX: Host not
                            found, try again)
                            Mar 24 13:58:35 smtp9 postfix/smtp[41720]: B7310D319AF:
                            to=<jnellore@...>, relay=none, delay=100406,
                            delays=100306/80/20/0, dsn=4.4.3, status=deferred (Host or domain name not
                            found. Name service error for name=entersoftsolutions.com type=MX: Host not
                            found, try again)
                            Mar 24 13:58:35 smtp9 postfix/error[41891]: B1D52D2CB9E:
                            to=<amit@...>, relay=none, delay=343163,
                            delays=343162/0.06/0/0.09, dsn=4.4.1, status=deferred (delivery temporarily
                            suspended: connect to globaltek-inc.com[208.73.211.164]:25: Connection timed
                            out)
                            Mar 24 13:58:35 smtp9 postfix/error[41807]: B39EED2C7A8:
                            to=<debc@...>, relay=none, delay=98252,
                            delays=98252/0.02/0/0.07, dsn=4.4.1, status=deferred (delivery temporarily
                            suspended: connect to careerconsultation.net[68.168.84.111]:25: Connection
                            timed out)
                            Mar 24 13:58:35 smtp9 postfix/smtp[41918]: A9230D48EA3:
                            to=<naren@...>, relay=mx00.1and1.com[74.208.5.3]:25, delay=14355,
                            delays=14275/79/0.23/0.87, dsn=2.0.0, status=sent (250 Message
                            0Lm1wv-1X1IDZ3s37-00aH7V accepted by mxus2.perfora.net)
                            Mar 24 13:58:35 smtp9 postfix/smtp[41490]: F3129290DB9:
                            to=<vkatkam@...>,
                            relay=smtp.secureserver.net[72.167.238.201]:25, delay=10196,
                            delays=10116/79/0.2/0.4, dsn=2.0.0, status=sent (250 ok: Message 633225220
                            accepted)
                            Mar 24 13:58:35 smtp9 postfix/smtp[41858]: C83B8289C20:
                            to=<bareq@...>,
                            relay=mx1.mysuperpageshosting.com[64.29.145.105]:25, delay=3883,
                            delays=3803/78/2.1/0.53, dsn=2.0.0, status=sent (250 2.0.0 s2PHxJgj017506
                            Message accepted for delivery)
                            Mar 24 13:58:36 smtp9 postfix/smtp[41791]: 7C03E2949A0:
                            to=<vishwa@...>, relay=mail.ishiftinc.com[66.147.244.234]:25,
                            delay=9165, delays=9084/78/2.3/0.53, dsn=5.0.0, status=bounced (host
                            mail.ishiftinc.com[66.147.244.234] said: 550 No Such User Here (in reply to
                            RCPT TO command))
                            Mar 24 13:58:36 smtp9 postfix/smtp[41715]: BC9AA28B635: to=<by@...>,
                            relay=mx-biz.mail.am0.yahoodns.net[98.139.171.245]:25, delay=6327,
                            delays=6244/79/0.07/4.6, dsn=2.0.0, status=sent (250 ok dirdel)
                            Mar 24 13:58:36 smtp9 postfix/smtp[41784]: 2DDE31D285CB:
                            to=<sampath@...>,
                            relay=mx-indiabiz.mail.gm0.yahoodns.net[106.10.149.139]:25, delay=12530,
                            delays=12448/78/1/2.5, dsn=2.0.0, status=sent (250 ok dirdel)
                            Mar 24 13:58:36 smtp9 postfix/error[41879]: BBAB415293F7:
                            to=<dilip@...>, relay=none, delay=331852,
                            delays=331851/0.16/0/0.09, dsn=4.4.3, status=deferred (delivery temporarily
                            suspended: Host or domain name not found. Name service error for
                            name=omegacsi.com type=MX: Host not found, try again)
                            Mar 24 13:58:36 smtp9 postfix/error[41901]: B50382A6738:
                            to=<btalwar@...>, relay=none, delay=86835,
                            delays=86834/0.16/0/0.09, dsn=4.4.1, status=deferred (delivery temporarily
                            suspended: connect to techpeople.com[199.59.243.107]:25: Connection timed
                            out)
                            Mar 24 13:58:36 smtp9 postfix/smtp[41918]: B85902A65B4:
                            to=<varma@...>, relay=aspmx.l.google.com[74.125.193.27]:25,
                            delay=1760, delays=1679/80/0.12/0.35, dsn=2.0.0, status=sent (250 2.0.0 OK
                            1395770362 k7si20309190icu.81 - gsmtp)
                            Mar 24 13:58:36 smtp9 postfix/smtp[41723]: DE9C3D384B8:
                            to=<UEMLMM1_87001233469636_100130001458@...>,
                            relay=conrepmail.com[208.112.16.157]:25, delay=15169, delays=15084/79/5/1.1,
                            dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as C14E32709DC)
                            Mar 24 13:58:36 smtp9 postfix/smtp[41526]: B88A429ED96:
                            to=<henrywang0001@...>, relay=mta6.am0.yahoodns.net[98.138.112.32]:25,
                            delay=6059, delays=5978/79/0.71/1.2, dsn=2.0.0, status=sent (250 ok dirdel)
                            Mar 24 13:58:36 smtp9 postfix/smtp[41858]: 281281128505:
                            to=<ali@...>, relay=inspiredinfotech.com[198.57.131.58]:25,
                            delay=13182, delays=13101/80/0.49/0.41, dsn=2.0.0, status=sent (250 OK
                            id=1WSVdC-0002P5-Rz)
                            Mar 24 13:58:36 smtp9 postfix/smtp[41791]: 995A829B9FE:
                            to=<agoli@...>, relay=mx3.mindspring.com[207.69.189.219]:25,
                            delay=7047, delays=6966/80/0.15/0.54, dsn=2.0.0, status=sent (250
                            1wsvDc4T83Nl3qa0 Message accepted for delivery)
                            Mar 24 13:58:37 smtp9 postfix/smtp[41806]: B0D0B28E3B2:
                            to=<sjreese@...>, relay=mailin-04.mx.aol.com[64.12.91.196]:25,
                            delay=10935, delays=10849/78/6.7/0.28, dsn=2.0.0, status=sent (250 2.0.0 Ok:
                            queued as 1DC5670000088)
                            Mar 24 13:58:37 smtp9 postfix/error[41903]: BC74D28A780:
                            to=<hyder@...>, relay=none, delay=86943,
                            delays=86942/0.03/0/0.22, dsn=4.4.3, status=deferred (delivery temporarily
                            suspended: Host or domain name not found. Name service error for
                            name=atcorporation.com type=MX: Host not found, try again)
                            Mar 24 13:58:37 smtp9 postfix/smtp[41579]: BA558D48AF2:
                            to=<sunitha@...>, relay=none, delay=354764, delays=354656/78/30/0,
                            dsn=4.4.1, status=deferred (connect to cronsys.org[74.220.199.6]:25:
                            Connection timed out)
                            Mar 24 13:58:37 smtp9 postfix/error[41879]: BF7D12894AC:
                            to=<mark@...>, relay=none, delay=360374,
                            delays=360373/0.21/0/0.06, dsn=4.4.1, status=deferred (delivery temporarily
                            suspended: connect to globaltek-inc.com[208.73.211.164]:25: Connection timed
                            out)
                            Mar 24 13:58:37 smtp9 postfix/smtp[41918]: C5B852998B4:
                            to=<lakshmi@...>, relay=ASPMX.L.GOOGLE.com[74.125.193.27]:25,
                            delay=7702, delays=7620/80/0.12/0.88, dsn=2.0.0, status=sent (250 2.0.0 OK
                            1395770363 nx5si20287515icb.152 - gsmtp)
                            Mar 24 13:58:37 smtp9 postfix/smtp[41791]: 0B1D1293A33:
                            to=<vardhans@...>, relay=aspmx.l.google.com[74.125.142.26]:25,
                            delay=9442, delays=9360/81/0.11/0.37, dsn=5.1.1, status=bounced (host
                            aspmx.l.google.com[74.125.142.26] said: 550-5.1.1 The email account that you
                            tried to reach does not exist. Please try 550-5.1.1 double-checking the
                            recipient's email address for typos or 550-5.1.1 unnecessary spaces. Learn
                            more at 550 5.1.1 http://support.google.com/mail/bin/answer.py?answer=6596
                            pe7si20296388icc.114 - gsmtp (in reply to RCPT TO command))
                            Mar 24 13:58:37 smtp9 postfix/smtp[41612]: B25FD289329:
                            to=<katam@...>,
                            relay=mx-biz.mail.am0.yahoodns.net[98.139.171.245]:25, delay=9602,
                            delays=9511/78/5.3/6.8, dsn=2.0.0, status=sent (250 ok dirdel)
                            Mar 24 13:58:37 smtp9 postfix/error[41903]: B486CD6817E:
                            to=<sophia@...>, relay=none, delay=337396, delays=337346/50/0/0.06,
                            dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to
                            cronsys.org[74.220.199.6]:25: Connection timed out)
                            Mar 24 13:58:37 smtp9 postfix/error[41880]: B0F8BD30CFD:
                            to=<sunitha@...>, relay=none, delay=354802, delays=354765/37/0/0.06,
                            dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to
                            cronsys.org[74.220.199.6]:25: Connection timed out)
                            Mar 24 13:58:37 smtp9 postfix/error[41901]: BC846289353:
                            to=<joe.maynard@...>, relay=none, delay=355426,
                            delays=355426/0.14/0/0.16, dsn=4.4.1, status=deferred (delivery temporarily
                            suspended: connect to smtp1.excell.com[97.65.110.13]:25: Connection timed
                            out)
                          • Noel Jones
                            ... Did you see Viktor s reply last week? https://www.mail-archive.com/postfix-users@postfix.org/msg56980.html ... This is uninteresting except many of these
                            Message 13 of 23 , Mar 25, 2014
                              On 3/25/2014 1:02 PM, KK Patnaik wrote:
                              > Please find my actual logs for the delays only. Please advise on how to
                              > handle this. I need to see that the delivery doesn't slow down because in
                              > this rate the emails are delivered after around 3-4hours.
                              >

                              Did you see Viktor's reply last week?
                              https://www.mail-archive.com/postfix-users@.../msg56980.html


                              > [root@smtp9 ~]# tail -f /var/log/maillog | grep delays

                              This is uninteresting except many of these seem to be undeliverable
                              for various reasons. See Viktor's reply for how to find useful
                              information.

                              I'm guessing these are undeliverable bounces. A queue clogged with
                              undeliverable bounces will perform poorly. You must not accept mail
                              that can't be delivered.

                              Find answers to the questions Viktor raises, and review the
                              documentation links he sent.


                              -- Noel Jones
                            • KK Patnaik
                              Hi Viktor, I have done the changes mentioned by you and now I see the delay has decreased from around 6hours to 1hour. Now I would still like to reduce the
                              Message 14 of 23 , Mar 29, 2014
                                Hi Viktor,

                                I have done the changes mentioned by you and now I see the delay has
                                decreased from around 6hours to 1hour. Now I would still like to reduce the
                                delay please suggest.

                                About the questions raised by you, yes the SMTP server generates bounces
                                messages and yes too many postmaster notices.

                                Please suggest.
                              • Viktor Dukhovni
                                ... http://www.postfix.org/postconf.5.html#notify_classes (set it empty) 1. You have said nothing about whether the bounces are for inbound mail to invalid
                                Message 15 of 23 , Mar 29, 2014
                                  On Sat, Mar 29, 2014 at 10:09:51PM +0530, KK Patnaik wrote:

                                  > About the questions raised by you, yes the SMTP server generates bounces
                                  > messages and yes too many postmaster notices.

                                  http://www.postfix.org/postconf.5.html#notify_classes

                                  (set it empty)

                                  1. You have said nothing about whether the bounces are for inbound
                                  mail to invalid recipients (fix recipient validation, which you
                                  disabled) or caused by outbound mail sent to invalid addresses
                                  (fix your mailing lists).

                                  http://www.postfix.org/ADDRESS_CLASS_README.html
                                  http://www.postfix.org/postconf.5.html#local_recipient_maps
                                  http://www.postfix.org/postconf.5.html#virtual_mailbox_maps
                                  http://www.postfix.org/postconf.5.html#relay_recipient_maps

                                  2. You have not posted any information from QSHAPE despite multiple
                                  attempts to point you at:

                                  http://www.postfix.org/QSHAPE_README.html

                                  3. You have not posted the requested statistics of "c+d" delays
                                  sampled over a few hours of mail deliveries (mean, median,
                                  and an ASCII histogram would be useful).

                                  4. Congestion is not a single message phenomenon, you MUST identify
                                  the bottleneck by understanding which destinations account for
                                  the majority of the delays, where that mail originates, and why
                                  its delivery is slow.

                                  Please don't waste our time with further questions that are not
                                  backed by the relevant quantitative information.

                                  --
                                  Viktor.
                                • KK Patnaik
                                  Hi Victor, I have emptied the notify_classes 1) Bounces are for outbound sent to lot of email addresses. And this is not spamming. We have mailing list server
                                  Message 16 of 23 , Mar 31, 2014
                                    Hi Victor,

                                    I have emptied the notify_classes
                                    1) Bounces are for outbound sent to lot of email addresses. And this is not
                                    spamming. We have mailing list server 4 numbers, those are maintained for
                                    around 80 clients, from there emails will be triggered through 9 SMTP
                                    servers where postfix is installed. Every server almost send half a million
                                    emails a day. These are only outbound servers. We have another one server
                                    oursmtpmail.com which receives all the bounces, etc. From this we read the
                                    inbox and include those hard / soft bouced emails to the skipped list and
                                    soft bounces would be released as per their reasons for skip.
                                    2) qshape -s
                                    T 5 10 20 40 80 160 320 640 1280
                                    1280+
                                    TOTAL 2466 2465 1 0 0 0 0 0 0 0
                                    0
                                    oursmtpmail.com 2118 2117 1 0 0 0 0 0 0 0
                                    0
                                    MAILER-DAEMON 348 348 0 0 0 0 0 0 0 0
                                    0
                                    The qshape information is around an hour back information. Now for last
                                    40mins it's still at the command prompt and I am not seeing any output as of
                                    now.
                                    3) Can you please suggest any tool which can give me ASCII histogram for the
                                    emails for the "c+d" delays.

                                    Now the postconf -n
                                    ------
                                    alias_database = hash:/etc/aliases
                                    alias_maps = hash:/etc/aliases
                                    bounce_queue_lifetime = 0
                                    broken_sasl_auth_clients = yes
                                    command_directory = /usr/sbin
                                    config_directory = /etc/postfix
                                    daemon_directory = /usr/libexec/postfix
                                    debug_peer_level = 2
                                    html_directory = no
                                    inet_interfaces = all
                                    local_recipient_maps =
                                    mail_owner = postfix
                                    mailq_path = /usr/bin/mailq.postfix
                                    manpage_directory = /usr/share/man
                                    maximal_queue_lifetime = 0
                                    message_size_limit = 50240000
                                    mydestination = $myhostname, localhost.$mydomain, localhost
                                    mydomain = smtp2.oursmtpmail.com
                                    myhostname = smtp2.oursmtpmail.com
                                    newaliases_path = /usr/bin/newaliases.postfix
                                    non_smtpd_milters = unix:/var/run/dkim-milter/dkim-milter.sock,
                                    unix:/var/run/dk-milter/dk-milter.sock
                                    notify_classes =
                                    queue_directory = /var/spool/postfix
                                    queue_run_delay = 2m
                                    readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
                                    relay_domains =
                                    sample_directory = /usr/share/doc/postfix-2.3.3/samples
                                    sendmail_path = /usr/sbin/sendmail.postfix
                                    setgid_group = postdrop
                                    smtpd_banner = smtp2.oursmtpmail.com
                                    smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated,
                                    reject_unauth_destination, reject_unknown_sender_domain
                                    smtpd_delay_reject = yes
                                    smtpd_error_sleep_time = 1s
                                    smtpd_hard_error_limit = 20
                                    smtpd_milters = unix:/var/run/dkim-milter/dkim-milter.sock,
                                    unix:/var/run/dk-milter/dk-milter.sock
                                    smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated,
                                    reject_unauth_destination
                                    smtpd_reject_unlisted_sender = yes
                                    smtpd_sasl_auth_enable = yes
                                    smtpd_sasl_path = private/auth
                                    smtpd_sasl_security_options = noanonymous
                                    smtpd_sasl_type = dovecot
                                    smtpd_soft_error_limit = 10
                                    transport_maps = hash:/etc/postfix/transport
                                    unknown_local_recipient_reject_code = 550
                                    virtual_alias_maps = hash:/etc/postfix/virtual
                                    virtual_mailbox_limit = 102400000
                                    ------------------

                                    Can you please suggest how to address the issue now?
                                  • Viktor Dukhovni
                                    ... Many bulk email senders believe the spammers are all the other bulk senders, but not they. ... Why -s , this gives no information about the destination of
                                    Message 17 of 23 , Mar 31, 2014
                                      On Mon, Mar 31, 2014 at 10:55:04PM +0530, KK Patnaik wrote:

                                      > 1) Bounces are for outbound sent to lot of email addresses. And this is not
                                      > spamming.

                                      Many bulk email senders believe the spammers are all the other bulk
                                      senders, but not they.

                                      > These are only outbound servers.

                                      > 2) qshape -s

                                      Why "-s", this gives no information about the destination of slow
                                      email. You should probably also scan the deferred queue, thus:

                                      # qshape incoming active deferred

                                      If the output device is a terminal, qshape will give you progressive
                                      output for every 1000 messages found.

                                      > The qshape information is around an hour back information. Now for last
                                      > 40mins it's still at the command prompt and I am not seeing any output as of
                                      > now.

                                      Sounds like you got slammed with a bunch of new mail and your disk
                                      sub-system in not fast enough for qshape to read the entire queue
                                      in a timely manner, especially with mail processing competing.

                                      > 3) Can you please suggest any tool which can give me ASCII histogram for the
                                      > emails for the "c+d" delays.

                                      You write a Perl or Python script to parse this from delays=a/b/c/d
                                      in your own logs.

                                      > bounce_queue_lifetime = 0
                                      > maximal_queue_lifetime = 0

                                      Bad idea.

                                      > non_smtpd_milters = unix:/var/run/dkim-milter/dkim-milter.sock,
                                      > unix:/var/run/dk-milter/dk-milter.sock
                                      > smtpd_milters = unix:/var/run/dkim-milter/dkim-milter.sock,
                                      > unix:/var/run/dk-milter/dk-milter.sock

                                      Is this keeping up with the mail stream? Perhaps this is a bottleneck.
                                      You must read your logs and determine what's going on. Have you tried
                                      the "collate" script I've sent?

                                      > Can you please suggest how to address the issue now?

                                      The data is in your logs, understanding them well enough to identify
                                      the problem source is your responsibility.

                                      You need to determine whether your CPU, network, disk or output
                                      concurrency are maxed out, or whether remote destinations are
                                      throttling your deliveries, ...

                                      Perhaps you syslogd is misconfigured and is logging synchronously.
                                      See LINUX_README.html. That would cause the disk to be swamped.

                                      --
                                      Viktor.
                                    • KK Patnaik
                                      Hi Viktor, 1) Please find the output of qshape in the link http://pastebin.com/pQ4h4pNY 2) Please find the top output at the time of peak hours top -
                                      Message 18 of 23 , Apr 1 3:58 PM
                                        Hi Viktor,

                                        1) Please find the output of qshape in the link http://pastebin.com/pQ4h4pNY


                                        2) Please find the "top" output at the time of peak hours

                                        top - 13:22:52 up 10:22, 3 users, load average: 5.36, 5.62, 5.62
                                        Tasks: 276 total, 1 running, 275 sleeping, 0 stopped, 0 zombie
                                        Cpu0 : 1.0%us, 0.4%sy, 0.5%ni, 90.9%id, 7.2%wa, 0.0%hi, 0.0%si,
                                        0.0%st
                                        Cpu1 : 1.9%us, 1.6%sy, 0.5%ni, 71.0%id, 24.3%wa, 0.1%hi, 0.7%si,
                                        0.0%st
                                        Cpu2 : 0.9%us, 0.9%sy, 0.3%ni, 92.4%id, 5.3%wa, 0.0%hi, 0.3%si,
                                        0.0%st
                                        Cpu3 : 0.9%us, 1.6%sy, 0.5%ni, 71.0%id, 25.1%wa, 0.2%hi, 0.8%si,
                                        0.0%st
                                        Mem: 4138404k total, 457076k used, 3681328k free, 44916k buffers
                                        Swap: 4096532k total, 8k used, 4096524k free, 151240k cached

                                        3) I ran the collate script sent by you. Checking that.

                                        Can you please suggest on the basis of qshape output and the CPU load?
                                      • Viktor Dukhovni
                                        ... Sorry, I don t read pastebins. You need to post the output (or at least lines for the top 20 or so domains) to the list. ... System is idle, which
                                        Message 19 of 23 , Apr 1 4:31 PM
                                          On Wed, Apr 02, 2014 at 04:28:48AM +0530, KK Patnaik wrote:

                                          > 1) Please find the output of qshape in the link http://pastebin.com/pQ4h4pNY

                                          Sorry, I don't read pastebins. You need to post the output (or at
                                          least lines for the top 20 or so domains) to the list.

                                          > 2) Please find the "top" output at the time of peak hours
                                          >
                                          > top - 13:22:52 up 10:22, 3 users, load average: 5.36, 5.62, 5.62
                                          > Tasks: 276 total, 1 running, 275 sleeping, 0 stopped, 0 zombie
                                          > Cpu0 : 1.0%us, 0.4%sy, 0.5%ni, 90.9%id, 7.2%wa, 0.0%hi, 0.0%si,
                                          > 0.0%st
                                          > Cpu1 : 1.9%us, 1.6%sy, 0.5%ni, 71.0%id, 24.3%wa, 0.1%hi, 0.7%si,
                                          > 0.0%st
                                          > Cpu2 : 0.9%us, 0.9%sy, 0.3%ni, 92.4%id, 5.3%wa, 0.0%hi, 0.3%si,
                                          > 0.0%st
                                          > Cpu3 : 0.9%us, 1.6%sy, 0.5%ni, 71.0%id, 25.1%wa, 0.2%hi, 0.8%si,
                                          > 0.0%st
                                          > Mem: 4138404k total, 457076k used, 3681328k free, 44916k buffers
                                          > Swap: 4096532k total, 8k used, 4096524k free, 151240k cached

                                          System is idle, which suggests high network latency, but impossible
                                          to tell without analyzing the logs!

                                          > 3) I ran the collate script sent by you. Checking that.

                                          It will show the collated history of various messages in the queue,
                                          based on the qshape output's top domains, look for any clues to
                                          the delay experienced by the corresponding domains. If these
                                          destinations are throttled in the queue manager look for the
                                          messages for which delivery is actually attempted:

                                          postfix/smtp[pid]: qid: to=..., ... dsn=...

                                          rather than immediately deferred because the destination is throttled:

                                          postfix/qmgr[pid]: <qid>: to=...

                                          > Can you please suggest on the basis of qshape output and the CPU load?

                                          Once you post the qshape output and some collated log entries for
                                          representative messages for highly delayed destinations. Feel free
                                          to obfuscate only the local part (user name) of the sender and
                                          recipient addresses, but NOT the domains, the actual domains may
                                          be essential to understanding why the queue is congested.

                                          --
                                          Viktor.
                                        • KK Patnaik
                                          Hi Viktor, 1) [root@smtp2]#qshape incoming active deferred T 5 10 20 40 80 160 320 640 1280 1280+ TOTAL 95414 8130 5019 11477 13835 33457 23496
                                          Message 20 of 23 , Apr 1 9:18 PM
                                            Hi Viktor,

                                            1) [root@smtp2]#qshape incoming active deferred
                                            T 5 10 20 40 80 160 320 640 1280
                                            1280+
                                            TOTAL 95414 8130 5019 11477 13835 33457 23496 0 0 0
                                            0
                                            conrepmail.com 16397 1871 606 1255 3142 6792 2731 0 0 0
                                            0
                                            aol.com 743 30 45 83 97 308 180 0 0 0
                                            0
                                            vsoftconsulting.com 356 10 12 49 43 146 96 0 0 0
                                            0
                                            nihaki.com 308 8 9 24 47 130 90 0 0 0
                                            0
                                            baanyan.com 277 7 8 26 42 115 79 0 0 0
                                            0
                                            sbcglobal.net 270 11 6 30 37 109 77 0 0 0
                                            0
                                            net.com 265 30 19 28 38 83 67 0 0 0
                                            0
                                            erpanderp.com 253 4 11 29 32 109 68 0 0 0
                                            0
                                            techgene.com 240 10 12 19 42 91 66 0 0 0
                                            0
                                            stansource.com 230 7 11 35 29 85 63 0 0 0
                                            0
                                            a1k.com 225 7 8 26 33 93 58 0 0 0
                                            0
                                            canvasinfotech.com 222 8 7 33 32 84 58 0 0 0
                                            0
                                            comsys.com 221 25 14 35 29 69 49 0 0 0
                                            0
                                            rsrit.com 214 8 11 28 35 88 44 0 0 0
                                            0
                                            usmsystems.com 213 4 13 26 24 87 59 0 0 0
                                            0
                                            compunnel.com 211 8 9 25 28 91 50 0 0 0
                                            0

                                            2)

                                            Mar 31 09:11:15 smtp2 postfix/smtpd[16466]: connect from
                                            mm3.conrep.com[76.12.143.99]
                                            Mar 31 09:11:15 smtp2 postfix/smtpd[16466]: 8872C12400DC:
                                            client=mm3.conrep.com[76.12.143.99], sasl_method=LOGIN,
                                            sasl_username=et2smtp
                                            Mar 31 09:11:15 smtp2 postfix/cleanup[16470]: 8872C12400DC:
                                            message-id=<20140331131115.8872C12400DC@...>
                                            Mar 31 09:11:15 smtp2 postfix/smtpd[16466]: disconnect from
                                            mm3.conrep.com[76.12.143.99]
                                            Mar 31 09:11:15 smtp2 postfix/qmgr[10231]: 8872C12400DC:
                                            from=<UEMLMM3_87001237348238_100130003682@...>, size=53529,
                                            nrcpt=1 (queue active)
                                            Mar 31 09:11:18 smtp2 postfix/smtp[15252]: 8872C12400DC:
                                            to=<abcdw@...>,
                                            relay=promorphics-com.mail.protection.outlook.com[207.46.163.138]:25,
                                            delay=2.9, delays=0.07/0/0.16/2.6, dsn=2.6.0, status=sent (250 2.6.0
                                            <20140331131115.8872C12400DC@...>
                                            [InternalId=22514218568637, Hostname=DM2PR04MB527.namprd04.prod.outlook.com]
                                            Queued mail for delivery)
                                            Mar 31 09:11:18 smtp2 postfix/qmgr[10231]: 8872C12400DC: removed

                                            Mar 31 09:11:04 smtp2 postfix/smtpd[16466]: connect from
                                            mm3.conrep.com[76.12.143.99]
                                            Mar 31 09:11:04 smtp2 postfix/smtpd[16466]: A594712400EF:
                                            client=mm3.conrep.com[76.12.143.99], sasl_method=LOGIN,
                                            sasl_username=et2smtp
                                            Mar 31 09:11:04 smtp2 postfix/cleanup[16500]: A594712400EF:
                                            message-id=<20140331131104.A594712400EF@...>
                                            Mar 31 09:11:04 smtp2 postfix/smtpd[16466]: disconnect from
                                            mm3.conrep.com[76.12.143.99]
                                            Mar 31 09:11:04 smtp2 postfix/qmgr[10231]: A594712400EF:
                                            from=<UEMLMM3_87001237344889_100130003681@...>, size=52656,
                                            nrcpt=1 (queue active)
                                            Mar 31 09:11:18 smtp2 postfix/smtp[12171]: A594712400EF:
                                            to=<abcdw@...>, relay=smtp.secureserver.net[68.178.213.37]:25,
                                            delay=14, delays=0.05/0/5.6/8.3, dsn=5.2.0, status=bounced (host
                                            smtp.secureserver.net[68.178.213.37] said: 552 5.2.0 kDB41n0172ClyZo01 -
                                            kDB41n0172ClyZo01DBAKn IB212 msg rejected as spam (in reply to end of DATA
                                            command))
                                            Mar 31 09:11:18 smtp2 postfix/bounce[15744]: A594712400EF: sender
                                            non-delivery notification: 89C8512400E9
                                            Mar 31 09:11:18 smtp2 postfix/qmgr[10231]: A594712400EF: removed

                                            Apr 1 09:38:58 smtp2 postfix/bounce[28302]: 191E8124012C: sender
                                            non-delivery notification: 36CB512400FA
                                            Apr 1 09:38:58 smtp2 postfix/qmgr[2728]: 191E8124012C: removed
                                            Apr 1 09:38:49 smtp2 postfix/smtpd[26815]: connect from
                                            mm3.conrep.com[76.12.143.99]
                                            Apr 1 09:38:49 smtp2 postfix/smtpd[26815]: 944671240115:
                                            client=mm3.conrep.com[76.12.143.99], sasl_method=LOGIN,
                                            sasl_username=et2smtp
                                            Apr 1 09:38:49 smtp2 postfix/cleanup[25611]: 944671240115:
                                            message-id=<20140401133849.944671240115@...>
                                            Apr 1 09:38:49 smtp2 postfix/smtpd[26815]: disconnect from
                                            mm3.conrep.com[76.12.143.99]
                                            Apr 1 09:38:49 smtp2 postfix/qmgr[2728]: 944671240115:
                                            from=<UEMLMM3_87001238209071_100130003977@...>, size=33790,
                                            nrcpt=1 (queue active)
                                            Apr 1 09:38:57 smtp2 postfix/smtp[20003]: 944671240115:
                                            to=<abcdw@...>, relay=none, delay=6.1, delays=0.04/3.5/2.6/0,
                                            dsn=4.4.3, status=deferred (Host or domain name not found. Name service
                                            error for name=thoughtmill.com type=MX: Host not found, try again)
                                            Apr 1 09:38:57 smtp2 postfix/qmgr[2728]: 944671240115:
                                            from=<UEMLMM3_87001238209071_100130003977@...>, status=expired,
                                            returned to sender
                                            Apr 1 09:38:58 smtp2 postfix/bounce[28306]: 944671240115: sender
                                            non-delivery notification: 2769A124008B
                                            Apr 1 09:38:58 smtp2 postfix/qmgr[2728]: 944671240115: removed
                                            Apr 1 09:38:25 smtp2 postfix/smtpd[26077]: connect from
                                            mm3.conrep.com[76.12.143.99]
                                            Apr 1 09:38:25 smtp2 postfix/smtpd[26077]: 6E35F1240105:
                                            client=mm3.conrep.com[76.12.143.99], sasl_method=LOGIN,
                                            sasl_username=et2smtp
                                            Apr 1 09:38:25 smtp2 postfix/cleanup[25753]: 6E35F1240105:
                                            message-id=<20140401133825.6E35F1240105@...>
                                            Apr 1 09:38:25 smtp2 postfix/smtpd[26077]: disconnect from
                                            mm3.conrep.com[76.12.143.99]
                                            Apr 1 09:38:25 smtp2 postfix/qmgr[2728]: 6E35F1240105:
                                            from=<UEMLMM3_87001238209015_100130003977@...>, size=33829,
                                            nrcpt=1 (queue active)
                                            Apr 1 09:38:45 smtp2 postfix/smtp[19719]: 6E35F1240105: host
                                            smtp.secureserver.net[68.178.213.37] refused to talk to me: 421
                                            p3plibsmtp02-02.prod.phx3.secureserver.net bizsmtp Connection refused, too
                                            many sessions from 76.12.143.102. IB007
                                            Apr 1 09:38:56 smtp2 postfix/smtp[19719]: 6E35F1240105:
                                            to=<akshay@...>,
                                            relay=mailstore1.secureserver.net[216.69.186.201]:25, delay=31,
                                            delays=0.22/0.48/29/1.6, dsn=5.0.0, status=bounced (host
                                            mailstore1.secureserver.net[216.69.186.201] said: 550 #5.1.0 Address
                                            rejected. (in reply to RCPT TO command))
                                            Apr 1 09:38:58 smtp2 postfix/bounce[28305]: 6E35F1240105: sender
                                            non-delivery notification: 27AAD12400BA
                                            Apr 1 09:38:58 smtp2 postfix/qmgr[2728]: 6E35F1240105: removed
                                            Apr 1 09:38:50 smtp2 postfix/smtpd[27410]: connect from
                                            mm3.conrep.com[76.12.143.99]
                                            Apr 1 09:38:50 smtp2 postfix/smtpd[27410]: 7A0FD1240142:
                                            client=mm3.conrep.com[76.12.143.99], sasl_method=LOGIN,
                                            sasl_username=et2smtp
                                            Apr 1 09:38:50 smtp2 postfix/cleanup[26051]: 7A0FD1240142:
                                            message-id=<20140401133850.7A0FD1240142@...>
                                            Apr 1 09:38:50 smtp2 postfix/smtpd[27410]: disconnect from
                                            mm3.conrep.com[76.12.143.99]
                                            Apr 1 09:38:50 smtp2 postfix/qmgr[2728]: 7A0FD1240142:
                                            from=<UEMLMM3_87001238193555_100130003976@...>, size=31273,
                                            nrcpt=1 (queue active)
                                            Apr 1 09:38:57 smtp2 postfix/smtp[19972]: 7A0FD1240142:
                                            to=<abcdw@...>, relay=none, delay=5.4, delays=0.05/5.3/0.02/0,
                                            dsn=5.4.4, status=bounced (Host or domain name not found. Name service error
                                            for name=betheltech.net type=A: Host not found)
                                            Apr 1 09:38:58 smtp2 postfix/bounce[28309]: 7A0FD1240142: sender
                                            non-delivery notification: 27AB912400CC
                                            Apr 1 09:38:58 smtp2 postfix/qmgr[2728]: 7A0FD1240142: removed


                                            The above are some of the results at the start of the day on 31st Mar and on
                                            1st Apr. Let me know if you need any further information in this regard.
                                          • KK Patnaik
                                            Viktor, Do you think that the emails which are being delivered to conrepmail.com are posing problem, do you think the conrepmail.com domain is receiving
                                            Message 21 of 23 , Apr 2 8:48 AM
                                              Viktor,
                                              Do you think that the emails which are being delivered to conrepmail.com are
                                              posing problem, do you think the conrepmail.com domain is receiving slowly?
                                            • Viktor Dukhovni
                                              ... Out of ~96000 still queued messages that arrived in a 2--3 hour window, 1 in 6 is a bounce back to your own domain. If you re not a spammer, your list
                                              Message 22 of 23 , Apr 2 8:56 AM
                                                On Wed, Apr 02, 2014 at 09:48:05AM +0530, KK Patnaik wrote:

                                                > 1) [root@smtp2]#qshape incoming active deferred
                                                > T 5 10 20 40 80 160
                                                > TOTAL 95414 8130 5019 11477 13835 33457 23496
                                                > conrepmail.com 16397 1871 606 1255 3142 6792 2731
                                                > aol.com 743 30 45 83 97 308 180
                                                > vsoftconsulting.com 356 10 12 49 43 146 96
                                                > nihaki.com 308 8 9 24 47 130 90
                                                > baanyan.com 277 7 8 26 42 115 79
                                                > sbcglobal.net 270 11 6 30 37 109 77
                                                > net.com 265 30 19 28 38 83 67
                                                > erpanderp.com 253 4 11 29 32 109 68
                                                > techgene.com 240 10 12 19 42 91 66
                                                > stansource.com 230 7 11 35 29 85 63
                                                > a1k.com 225 7 8 26 33 93 58
                                                > canvasinfotech.com 222 8 7 33 32 84 58
                                                > comsys.com 221 25 14 35 29 69 49
                                                > rsrit.com 214 8 11 28 35 88 44
                                                > usmsystems.com 213 4 13 26 24 87 59
                                                > compunnel.com 211 8 9 25 28 91 50

                                                Out of ~96000 still queued messages that arrived in a 2--3 hour
                                                window, 1 in 6 is a bounce back to your own domain. If you're not
                                                a spammer, your list management practices are extremely poor. If
                                                your intent is to process mail for legitimate non-spamming customers,
                                                you are not doing a good job of keeping the folks with garbage lists
                                                away.

                                                Furthermore, why are bounces back to your own domain not delivered
                                                promptly? Your bounce rate should probably be well below 2%, not
                                                16%. You should be using the "relay" transport to reach
                                                conrepmail.com so that bounces don't queue behind outbound mail.

                                                I asked for collated samples for delayed mail from some of the
                                                above most delayed domains, below you show mail that was not
                                                substantially delayed. You're wasting everyone's time presenting
                                                tiny crumbs of information, and often the wrong crumbs.

                                                There are still no "c+d" statistics (moving expontially decaying
                                                average over time is best).

                                                # If handling multi-recipient mail, process only the first of
                                                # multiple log entries with same smtpd[<pid>] and same queue-id
                                                # logged during the same minute.
                                                #
                                                foreach SMTP delivery # insert real code here
                                                $meancd = 0.99 * $meancd + 0.01 * ($c + $d);
                                                if ($count % 100 == 0) {
                                                printf "%s %s\n", $delivery_time, $meancd;
                                                }

                                                > Mar 31 09:11:15 smtp2 postfix/smtpd[16466]: connect from mm3.conrep.com[76.12.143.99]
                                                > Mar 31 09:11:15 smtp2 postfix/qmgr[10231]: 8872C12400DC:
                                                > from=<UEMLMM3_87001237348238_100130003682@...>, size=53529,
                                                > nrcpt=1 (queue active)

                                                No delay entering the active queue, and this is not one of the domains
                                                at the top of the qshape listing AND:

                                                > Mar 31 09:11:18 smtp2 postfix/smtp[15252]: 8872C12400DC:
                                                > to=<abcdw@...>,
                                                > relay=promorphics-com.mail.protection.outlook.com[207.46.163.138]:25,
                                                > delay=2.9, delays=0.07/0/0.16/2.6, dsn=2.6.0, status=sent
                                                > (250 2.6.0 <20140331131115.8872C12400DC@...>
                                                > [InternalId=22514218568637,
                                                > Hostname=DM2PR04MB527.namprd04.prod.outlook.com]
                                                > Queued mail for delivery)

                                                the "a + b" delays here sum to 0.07 seconds. This is not a delayed
                                                message, you're wasting everyone's time with this.

                                                > Mar 31 09:11:18 smtp2 postfix/smtp[12171]: A594712400EF:
                                                > to=<abcdw@...>, relay=smtp.secureserver.net[68.178.213.37]:25,
                                                > delay=14, delays=0.05/0/5.6/8.3, dsn=5.2.0, status=bounced (host
                                                > smtp.secureserver.net[68.178.213.37] said: 552 5.2.0 kDB41n0172ClyZo01 -
                                                > kDB41n0172ClyZo01DBAKn IB212 msg rejected as spam (in reply to end of DATA
                                                > command))

                                                Ditto, but now we see that some receving systems concur that the
                                                messages are likely spam.

                                                > Apr 1 09:38:57 smtp2 postfix/smtp[20003]: 944671240115:
                                                > to=<abcdw@...>, relay=none, delay=6.1, delays=0.04/3.5/2.6/0,
                                                > dsn=4.4.3, status=deferred (Host or domain name not found. Name service
                                                > error for name=thoughtmill.com type=MX: Host not found, try again)

                                                Mail to a bogus domain, still low total delay, ...

                                                > Apr 1 09:38:58 smtp2 postfix/bounce[28306]: 944671240115: sender
                                                > non-delivery notification: 2769A124008B

                                                Premature bounce due to disabled retries preventing interoperation
                                                with greylisting...

                                                > Apr 1 09:38:56 smtp2 postfix/smtp[19719]: 6E35F1240105:
                                                > to=<akshay@...>,
                                                > relay=mailstore1.secureserver.net[216.69.186.201]:25, delay=31,
                                                > delays=0.22/0.48/29/1.6, dsn=5.0.0, status=bounced (host
                                                > mailstore1.secureserver.net[216.69.186.201] said: 550 #5.1.0 Address
                                                > rejected. (in reply to RCPT TO command))

                                                Poor list management still low cumulative delay, but finally a very
                                                high $c, connecting to the backup MX.

                                                > Apr 1 09:38:57 smtp2 postfix/smtp[19972]: 7A0FD1240142:
                                                > to=<abcdw@...>, relay=none, delay=5.4, delays=0.05/5.3/0.02/0,
                                                > dsn=5.4.4, status=bounced (Host or domain name not found. Name service error
                                                > for name=betheltech.net type=A: Host not found)
                                                > Apr 1 09:38:58 smtp2 postfix/bounce[28309]: 7A0FD1240142: sender
                                                > non-delivery notification: 27AB912400CC

                                                Still low $a + $b (the queue is not congested yet) and negligible
                                                $c + $d) since destination domain is bogus and another bounce.

                                                > The above are some of the results at the start of the day on 31st Mar and on
                                                > 1st Apr. Let me know if you need any further information in this regard.

                                                I'd done here. You're on your own.

                                                --
                                                Viktor.
                                              • KK Patnaik
                                                Hi Viktor, Thanks for your time and patience. I added the relay transport to reach conrepmail.com and it became a bit faster yesterday. And today it is
                                                Message 23 of 23 , Apr 3 6:37 AM
                                                  Hi Viktor,

                                                  Thanks for your time and patience. I added the "relay" transport to reach
                                                  conrepmail.com and it became a bit faster yesterday. And today it is somehow
                                                  smooth but I still want to fasten it up. Is there any method through which
                                                  the mails to conrepmail.com can be stored on a local account and later I can
                                                  read them through POP3?

                                                  Kindly suggest.

                                                  -----Original Message-----
                                                  From: owner-postfix-users@...
                                                  [mailto:owner-postfix-users@...] On Behalf Of Viktor Dukhovni
                                                  Sent: Wednesday, April 02, 2014 9:27 PM
                                                  To: postfix-users@...
                                                  Subject: Re: Mails time before queue manager

                                                  On Wed, Apr 02, 2014 at 09:48:05AM +0530, KK Patnaik wrote:

                                                  > 1) [root@smtp2]#qshape incoming active deferred
                                                  > T 5 10 20 40 80 160
                                                  > TOTAL 95414 8130 5019 11477 13835 33457 23496
                                                  > conrepmail.com 16397 1871 606 1255 3142 6792 2731
                                                  > aol.com 743 30 45 83 97 308 180
                                                  > vsoftconsulting.com 356 10 12 49 43 146 96
                                                  > nihaki.com 308 8 9 24 47 130 90
                                                  > baanyan.com 277 7 8 26 42 115 79
                                                  > sbcglobal.net 270 11 6 30 37 109 77
                                                  > net.com 265 30 19 28 38 83 67
                                                  > erpanderp.com 253 4 11 29 32 109 68
                                                  > techgene.com 240 10 12 19 42 91 66
                                                  > stansource.com 230 7 11 35 29 85 63
                                                  > a1k.com 225 7 8 26 33 93 58
                                                  > canvasinfotech.com 222 8 7 33 32 84 58
                                                  > comsys.com 221 25 14 35 29 69 49
                                                  > rsrit.com 214 8 11 28 35 88 44
                                                  > usmsystems.com 213 4 13 26 24 87 59
                                                  > compunnel.com 211 8 9 25 28 91 50

                                                  Out of ~96000 still queued messages that arrived in a 2--3 hour window, 1 in
                                                  6 is a bounce back to your own domain. If you're not a spammer, your list
                                                  management practices are extremely poor. If your intent is to process mail
                                                  for legitimate non-spamming customers, you are not doing a good job of
                                                  keeping the folks with garbage lists away.

                                                  Furthermore, why are bounces back to your own domain not delivered promptly?
                                                  Your bounce rate should probably be well below 2%, not 16%. You should be
                                                  using the "relay" transport to reach conrepmail.com so that bounces don't
                                                  queue behind outbound mail.

                                                  I asked for collated samples for delayed mail from some of the above most
                                                  delayed domains, below you show mail that was not substantially delayed.
                                                  You're wasting everyone's time presenting tiny crumbs of information, and
                                                  often the wrong crumbs.

                                                  There are still no "c+d" statistics (moving expontially decaying average
                                                  over time is best).

                                                  # If handling multi-recipient mail, process only the first of
                                                  # multiple log entries with same smtpd[<pid>] and same queue-id
                                                  # logged during the same minute.
                                                  #
                                                  foreach SMTP delivery # insert real code here
                                                  $meancd = 0.99 * $meancd + 0.01 * ($c + $d);
                                                  if ($count % 100 == 0) {
                                                  printf "%s %s\n", $delivery_time, $meancd;
                                                  }

                                                  > Mar 31 09:11:15 smtp2 postfix/smtpd[16466]: connect from
                                                  > mm3.conrep.com[76.12.143.99] Mar 31 09:11:15 smtp2 postfix/qmgr[10231]:
                                                  8872C12400DC:
                                                  > from=<UEMLMM3_87001237348238_100130003682@...>, size=53529,
                                                  > nrcpt=1 (queue active)

                                                  No delay entering the active queue, and this is not one of the domains at
                                                  the top of the qshape listing AND:

                                                  > Mar 31 09:11:18 smtp2 postfix/smtp[15252]: 8872C12400DC:
                                                  > to=<abcdw@...>,
                                                  >
                                                  relay=promorphics-com.mail.protection.outlook.com[207.46.163.138]:25,
                                                  > delay=2.9, delays=0.07/0/0.16/2.6, dsn=2.6.0, status=sent
                                                  > (250 2.6.0 <20140331131115.8872C12400DC@...>
                                                  > [InternalId=22514218568637,
                                                  > Hostname=DM2PR04MB527.namprd04.prod.outlook.com]
                                                  > Queued mail for delivery)

                                                  the "a + b" delays here sum to 0.07 seconds. This is not a delayed message,
                                                  you're wasting everyone's time with this.

                                                  > Mar 31 09:11:18 smtp2 postfix/smtp[12171]: A594712400EF:
                                                  > to=<abcdw@...>,
                                                  > relay=smtp.secureserver.net[68.178.213.37]:25,
                                                  > delay=14, delays=0.05/0/5.6/8.3, dsn=5.2.0, status=bounced (host
                                                  > smtp.secureserver.net[68.178.213.37] said: 552 5.2.0 kDB41n0172ClyZo01
                                                  > - kDB41n0172ClyZo01DBAKn IB212 msg rejected as spam (in reply to end
                                                  > of DATA
                                                  > command))

                                                  Ditto, but now we see that some receving systems concur that the messages
                                                  are likely spam.

                                                  > Apr 1 09:38:57 smtp2 postfix/smtp[20003]: 944671240115:
                                                  > to=<abcdw@...>, relay=none, delay=6.1,
                                                  > delays=0.04/3.5/2.6/0, dsn=4.4.3, status=deferred (Host or domain name
                                                  > not found. Name service error for name=thoughtmill.com type=MX: Host
                                                  > not found, try again)

                                                  Mail to a bogus domain, still low total delay, ...

                                                  > Apr 1 09:38:58 smtp2 postfix/bounce[28306]: 944671240115: sender
                                                  > non-delivery notification: 2769A124008B

                                                  Premature bounce due to disabled retries preventing interoperation with
                                                  greylisting...

                                                  > Apr 1 09:38:56 smtp2 postfix/smtp[19719]: 6E35F1240105:
                                                  > to=<akshay@...>,
                                                  > relay=mailstore1.secureserver.net[216.69.186.201]:25, delay=31,
                                                  > delays=0.22/0.48/29/1.6, dsn=5.0.0, status=bounced (host
                                                  > mailstore1.secureserver.net[216.69.186.201] said: 550 #5.1.0 Address
                                                  > rejected. (in reply to RCPT TO command))

                                                  Poor list management still low cumulative delay, but finally a very high $c,
                                                  connecting to the backup MX.

                                                  > Apr 1 09:38:57 smtp2 postfix/smtp[19972]: 7A0FD1240142:
                                                  > to=<abcdw@...>, relay=none, delay=5.4,
                                                  > delays=0.05/5.3/0.02/0, dsn=5.4.4, status=bounced (Host or domain name
                                                  > not found. Name service error for name=betheltech.net type=A: Host not
                                                  > found) Apr 1 09:38:58 smtp2 postfix/bounce[28309]: 7A0FD1240142:
                                                  > sender non-delivery notification: 27AB912400CC

                                                  Still low $a + $b (the queue is not congested yet) and negligible $c + $d)
                                                  since destination domain is bogus and another bounce.

                                                  > The above are some of the results at the start of the day on 31st Mar
                                                  > and on 1st Apr. Let me know if you need any further information in this
                                                  regard.

                                                  I'd done here. You're on your own.

                                                  --
                                                  Viktor.
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