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Re: email from comcast.net is bouncing

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  • Grant
    ... # postconf -n command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix
    Message 1 of 23 , Aug 27, 2013
      >> >> >> SUBJECT: Delivery status notification
      >> >> >> This is an automatically generated Delivery Status Notification.
      >> >> >> Delivery to the following recipients was aborted after 7 second(s):
      >> >> >> MASKED@...
      >> >> >
      >> >> > If you want that mail, whitelist them,
      >> >>
      >> >> They should already be whitelisted through my use of list.dnswl.org.
      >> >
      >> > Your SMTP server replied with 450. Either your configuration is
      >> > wrong, or some DNS lookups time out. Note the above text says:
      >> >
      >> > Delivery to the following recipients was aborted after 7 second(s)
      >> >
      >> > This could be a symptom of DNS lookup timeout.
      >>
      >> Something must be wrong with my config. In my log I can see that
      >> postfix is returning 450 to many more comcast.net messages than it's
      >
      > Please show "postconf -n" command output (not cut-and-paste from
      > main.cf).

      # postconf -n
      command_directory = /usr/sbin
      config_directory = /etc/postfix
      daemon_directory = /usr/libexec/postfix
      data_directory = /var/lib/postfix
      debug_peer_level = 2
      debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
      ddd $daemon_directory/$process_name $process_id & sleep 5
      home_mailbox = .maildir/
      html_directory = no
      inet_protocols = ipv4
      mail_owner = postfix
      mailq_path = /usr/bin/mailq
      manpage_directory = /usr/share/man
      message_size_limit = 40960000
      mydestination = MASKED.com MASKED.com
      myhostname = MASKED.com
      mynetworks_style = host
      newaliases_path = /usr/bin/newaliases
      postscreen_bare_newline_action = enforce
      postscreen_bare_newline_enable = yes
      postscreen_dnsbl_sites = zen.spamhaus.org list.dnswl.org*-1
      postscreen_dnsbl_whitelist_threshold = -1
      postscreen_greet_action = enforce
      postscreen_non_smtp_command_action = enforce
      postscreen_non_smtp_command_enable = yes
      postscreen_pipelining_action = enforce
      postscreen_pipelining_enable = yes
      queue_directory = /var/spool/postfix
      readme_directory = no
      sample_directory = /etc/postfix
      sendmail_path = /usr/sbin/sendmail
      setgid_group = postdrop
      smtpd_recipient_restrictions = reject_unauth_destination, permit
      smtpd_tls_CAfile = /etc/ssl/postfix/cacert.pem
      smtpd_tls_auth_only = yes
      smtpd_tls_cert_file = /etc/ssl/postfix/newcert.pem
      smtpd_tls_key_file = /etc/ssl/postfix/newkey.pem
      smtpd_tls_security_level = may
      smtpd_tls_session_cache_timeout = 3600s
      tls_random_source = dev:/dev/urandom
      unknown_local_recipient_reject_code = 550
      virtual_alias_maps = hash:/etc/postfix/virtual

      > Please show one complete logfile record from "connect from" until
      > "reject" that demonstrates the problem (you may anonymize the email
      > address).

      Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from [209.85.219.51]:41193
      Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
      [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
      from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
      helo=<mail-oa0-f51.google.com>
      Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193

      The IP is whitelisted:

      http://dnswl.org/s?s=209.85.219.51

      >> >> I also have several of these:
      >> >>
      >> >> lost connection with mx1.comcast.net[68.87.26.147] while receiving the
      >> >> initial server greeting
      >> >> conversation with mx1.comcast.net[68.87.26.147] timed out while
      >> >> receiving the initial server greeting
      >> >
      >> > Your SMTP *client* also has problems. Consider monitoring your
      >> > packet loss rate. I run "mtr" from a cron job.
      >>
      >> Is it the sender's SMTP client that has problems?
      >
      > Please show one complete logfile record (you may anonymize the email
      > address).

      Aug 23 06:35:11 [postfix/smtp] 72A0E5C801E: conversation with
      mx1.comcast.net[68.87.26.147] timed out while receiving the initial
      server greeting
      Aug 23 09:04:03 [postfix/smtp] 80A8A5C801E: lost connection with
      mx1.comcast.net[68.87.26.147] while receiving the initial server
      greeting

      - Grant
    • Wietse Venema
      ... As documented, the above settings will cause Postfix to reject mail with 4XX: http://www.postfix.org/POSTSCREEN_README.html#after_220 ... This feature
      Message 2 of 23 , Aug 27, 2013
        Grant:
        > Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from [209.85.219.51]:41193
        > Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
        > [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
        > from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
        > helo=<mail-oa0-f51.google.com>
        > Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193
        ...
        > postscreen_bare_newline_enable = yes
        > postscreen_non_smtp_command_enable = yes
        > postscreen_pipelining_enable = yes

        As documented, the above settings will cause Postfix to reject mail
        with 4XX:

        http://www.postfix.org/POSTSCREEN_README.html#after_220

        > postscreen_dnsbl_sites = zen.spamhaus.org list.dnswl.org*-1
        > postscreen_dnsbl_whitelist_threshold = -1

        This feature requires Postfix 2.11 snapshot 20130512 or later.
        You can find out which version you have with:

        postconf mail_version

        > Aug 23 06:35:11 [postfix/smtp] 72A0E5C801E: conversation with
        > mx1.comcast.net[68.87.26.147] timed out while receiving the initial
        > server greeting
        > Aug 23 09:04:03 [postfix/smtp] 80A8A5C801E: lost connection with
        > mx1.comcast.net[68.87.26.147] while receiving the initial server
        > greeting

        These warnings are from your Postfix SMTP client.

        Wietse
      • /dev/rob0
        ... Indeed! ... Check again. Is the logging complete? Where are the dnsblog(8) log entries? If this is in fact all the logging you got from this connection,
        Message 3 of 23 , Aug 27, 2013
          On Tue, Aug 27, 2013 at 12:56:42AM -0700, Grant wrote:
          > >> >> >> SUBJECT: Delivery status notification
          > >> >> >> This is an automatically generated Delivery Status
          > >> >> >> Notification. Delivery to the following recipients was
          > >> >> >> aborted after 7 second(s): MASKED@...
          > >> >> >
          > >> >> > If you want that mail, whitelist them,
          > >> >>
          > >> >> They should already be whitelisted through my use of
          > >> >> list.dnswl.org.
          > >> >
          > >> > Your SMTP server replied with 450. Either your configuration
          > >> > is wrong, or some DNS lookups time out. Note the above text
          > >> > says:
          > >> >
          > >> > Delivery to the following recipients was aborted after 7
          > >> > second(s)
          > >> >
          > >> > This could be a symptom of DNS lookup timeout.

          Indeed!

          > > Please show one complete logfile record from "connect from"
          > > until "reject" that demonstrates the problem (you may anonymize
          > > the email address).
          >
          > Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from
          > [209.85.219.51]:41193
          > Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
          > [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
          > from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
          > helo=<mail-oa0-f51.google.com>
          > Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193
          >
          > The IP is whitelisted:
          >
          > http://dnswl.org/s?s=209.85.219.51

          Check again. Is the logging complete? Where are the dnsblog(8) log
          entries? If this is in fact all the logging you got from this
          connection, you're not getting your list.dnswl.org lookup.
          --
          http://rob0.nodns4.us/ -- system administration and consulting
          Offlist GMX mail is seen only if "/dev/rob0" is in the Subject:
        • Wietse Venema
          ... Good point. dnsblog will be silent ONLY when list.dnswl.org replies that the IP address is not listed (and perhaps when you send more queries than your
          Message 4 of 23 , Aug 27, 2013
            /dev/rob0:
            > > Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from
            > > [209.85.219.51]:41193
            > > Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
            > > [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
            > > from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
            > > helo=<mail-oa0-f51.google.com>
            > > Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193
            > >
            > > The IP is whitelisted:
            > >
            > > http://dnswl.org/s?s=209.85.219.51
            >
            > Check again. Is the logging complete? Where are the dnsblog(8) log
            > entries? If this is in fact all the logging you got from this
            > connection, you're not getting your list.dnswl.org lookup.

            Good point. dnsblog will be silent ONLY when list.dnswl.org replies
            that the IP address is not listed (and perhaps when you send more
            queries than your dnswl.org subscription allows).

            Also the logging above is incomplete. You left out the CONNECT
            logging from postscreen (and perhaps more).

            For the complete postscreen/tlsproxy log:

            grep '\[209.85.219.51\]:41193' the-maillog-file

            for the dnsblog log

            grep 'Aug 26 21:21.*dnsblog.*209.85.219.51'

            Wietse
          • Grant
            ... Yes but the issue is that the whitelist doesn t seem to be working. ... # postconf mail_version mail_version = 2.11-20130818 ... Do they necessarily
            Message 5 of 23 , Aug 30, 2013
              >> Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from [209.85.219.51]:41193
              >> Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
              >> [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
              >> from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
              >> helo=<mail-oa0-f51.google.com>
              >> Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193
              > ...
              >> postscreen_bare_newline_enable = yes
              >> postscreen_non_smtp_command_enable = yes
              >> postscreen_pipelining_enable = yes
              >
              > As documented, the above settings will cause Postfix to reject mail
              > with 4XX:
              >
              > http://www.postfix.org/POSTSCREEN_README.html#after_220

              Yes but the issue is that the whitelist doesn't seem to be working.

              >> postscreen_dnsbl_sites = zen.spamhaus.org list.dnswl.org*-1
              >> postscreen_dnsbl_whitelist_threshold = -1
              >
              > This feature requires Postfix 2.11 snapshot 20130512 or later.
              > You can find out which version you have with:
              >
              > postconf mail_version

              # postconf mail_version
              mail_version = 2.11-20130818

              >> Aug 23 06:35:11 [postfix/smtp] 72A0E5C801E: conversation with
              >> mx1.comcast.net[68.87.26.147] timed out while receiving the initial
              >> server greeting
              >> Aug 23 09:04:03 [postfix/smtp] 80A8A5C801E: lost connection with
              >> mx1.comcast.net[68.87.26.147] while receiving the initial server
              >> greeting
              >
              > These warnings are from your Postfix SMTP client.

              Do they necessarily indicate a problem with my postfix or could they
              be due to a problem with the server on the other end?

              - Grant
            • Grant
              ... # grep [209.85.219.51 ]:41193 -R /var/log/mail Aug 26 21:21:29 [postfix/postscreen] CONNECT from [209.85.219.51]:41193 to [MASKED]:25 Aug 26 21:21:35
              Message 6 of 23 , Aug 30, 2013
                >> > Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from
                >> > [209.85.219.51]:41193
                >> > Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
                >> > [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
                >> > from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
                >> > helo=<mail-oa0-f51.google.com>
                >> > Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193
                >> >
                >> > The IP is whitelisted:
                >> >
                >> > http://dnswl.org/s?s=209.85.219.51
                >>
                >> Check again. Is the logging complete? Where are the dnsblog(8) log
                >> entries? If this is in fact all the logging you got from this
                >> connection, you're not getting your list.dnswl.org lookup.
                >
                > Good point. dnsblog will be silent ONLY when list.dnswl.org replies
                > that the IP address is not listed (and perhaps when you send more
                > queries than your dnswl.org subscription allows).
                >
                > Also the logging above is incomplete. You left out the CONNECT
                > logging from postscreen (and perhaps more).
                >
                > For the complete postscreen/tlsproxy log:
                >
                > grep '\[209.85.219.51\]:41193' the-maillog-file

                # grep '\[209.85.219.51\]:41193' -R /var/log/mail
                Aug 26 21:21:29 [postfix/postscreen] CONNECT from
                [209.85.219.51]:41193 to [MASKED]:25
                Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from [209.85.219.51]:41193
                Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
                [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
                from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
                helo=<mail-oa0-f51.google.com>
                Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193
                Aug 26 21:21:36 [postfix/postscreen] HANGUP after 0.1 from
                [209.85.219.51]:41193 in tests after SMTP handshake
                Aug 26 21:21:36 [postfix/postscreen] PASS NEW [209.85.219.51]:41193
                Aug 26 21:21:36 [postfix/postscreen] DISCONNECT [209.85.219.51]:41193

                > for the dnsblog log
                >
                > grep 'Aug 26 21:21.*dnsblog.*209.85.219.51'

                # grep '.*dnsblog.*209.85.219.51' -R /var/log/mail
                #

                I grep'ed the mail logs for dnsblog and got a huge number of these:

                [postfix/postscreen] warning: psc_dnsbl_request: connect to
                private/dnsblog service: No such file or directory

                - Grant
              • Noel Jones
                ... Looks as if you ve found the problem. Make sure your master.cf has an entry like: dnsblog unix - - n - 0 dnsblog -- Noel
                Message 7 of 23 , Aug 30, 2013
                  On 8/30/2013 3:44 AM, Grant wrote:
                  >
                  > I grep'ed the mail logs for dnsblog and got a huge number of these:
                  >
                  > [postfix/postscreen] warning: psc_dnsbl_request: connect to
                  > private/dnsblog service: No such file or directory

                  Looks as if you've found the problem.

                  Make sure your master.cf has an entry like:

                  dnsblog unix - - n - 0 dnsblog




                  -- Noel Jones
                • Wietse Venema
                  ... Where is the dnsblog logging? dnsblog will complain if the reply does not arrive, or if it arrives too late. grep 209.85.219.51 the-maillog-file Where is
                  Message 8 of 23 , Aug 30, 2013
                    Grant:
                    > >> Aug 26 21:21:35 [postfix/tlsproxy] CONNECT from [209.85.219.51]:41193
                    > >> Aug 26 21:21:36 [postfix/postscreen] NOQUEUE: reject: RCPT from
                    > >> [209.85.219.51]:41193: 450 4.3.2 Service currently unavailable;
                    > >> from=<MASKED@...>, to=<MASKED@...>, proto=ESMTP,
                    > >> helo=<mail-oa0-f51.google.com>
                    > >> Aug 26 21:21:36 [postfix/tlsproxy] DISCONNECT [209.85.219.51]:41193
                    > > ...
                    > >> postscreen_bare_newline_enable = yes
                    > >> postscreen_non_smtp_command_enable = yes
                    > >> postscreen_pipelining_enable = yes
                    > >
                    > > As documented, the above settings will cause Postfix to reject mail
                    > > with 4XX:
                    > >
                    > > http://www.postfix.org/POSTSCREEN_README.html#after_220
                    >
                    > Yes but the issue is that the whitelist doesn't seem to be working.

                    Where is the dnsblog logging? dnsblog will complain if the reply
                    does not arrive, or if it arrives too late.

                    grep 209.85.219.51 the-maillog-file

                    Where is the postscreen logging *before* tlsproxy's CONNECT event?

                    grep 209.85.219.51.:41193 the maillog file

                    Why don't provide the information that you have been asked for?

                    Wietse
                  • Grant
                    ... Thank you. I added it and restarted postfix and started to get errors like these: [postfix/dnsblog] warning: dnsblog_query: lookup error for DNS query
                    Message 9 of 23 , Aug 30, 2013
                      >> I grep'ed the mail logs for dnsblog and got a huge number of these:
                      >>
                      >> [postfix/postscreen] warning: psc_dnsbl_request: connect to
                      >> private/dnsblog service: No such file or directory
                      >
                      > Looks as if you've found the problem.
                      >
                      > Make sure your master.cf has an entry like:
                      >
                      > dnsblog unix - - n - 0 dnsblog

                      Thank you. I added it and restarted postfix and started to get errors
                      like these:

                      [postfix/dnsblog] warning: dnsblog_query: lookup error for DNS query
                      MASKED.list.dnswl.org: Host or domain name not found. Name service
                      error for name=MASKED.list.dnswl.org type=A: Host not found, try again

                      I did some searching and I think this was due to my use of Google's
                      DNS resolvers (8.8.8.8 and 8.8.4.4). I added my host's DNS resolver
                      first in the list and the errors seem to have stopped. Is that a good
                      config?

                      I also read a recommendation to set up a caching nameserver like
                      unbound on the same machine as postfix. Is that the right thing to
                      do?

                      Is there a way to verify that everything is working properly?

                      - Grant
                    • Noel Jones
                      ... Postfix always add missing master.cf entries automatically as part of the upgrade procedure. You can break this by restoring an old file after the
                      Message 10 of 23 , Aug 30, 2013
                        On 8/30/2013 2:27 PM, Grant wrote:
                        >>> I grep'ed the mail logs for dnsblog and got a huge number of these:
                        >>>
                        >>> [postfix/postscreen] warning: psc_dnsbl_request: connect to
                        >>> private/dnsblog service: No such file or directory
                        >>
                        >> Looks as if you've found the problem.
                        >>
                        >> Make sure your master.cf has an entry like:
                        >>
                        >> dnsblog unix - - n - 0 dnsblog
                        >
                        > Thank you. I added it and restarted postfix and started to get errors
                        > like these:

                        Postfix always add missing master.cf entries automatically as part
                        of the upgrade procedure. You can break this by restoring an old
                        file after the upgrade.


                        >
                        > [postfix/dnsblog] warning: dnsblog_query: lookup error for DNS query
                        > MASKED.list.dnswl.org: Host or domain name not found. Name service
                        > error for name=MASKED.list.dnswl.org type=A: Host not found, try again
                        >
                        > I did some searching and I think this was due to my use of Google's
                        > DNS resolvers (8.8.8.8 and 8.8.4.4). I added my host's DNS resolver
                        > first in the list and the errors seem to have stopped. Is that a good
                        > config?

                        Yes, good. Many public DNS servers are denied access by RBL
                        providers due to excessive query load.

                        Using your own DNS is the proper solution.

                        >
                        > I also read a recommendation to set up a caching nameserver like
                        > unbound on the same machine as postfix. Is that the right thing to
                        > do?

                        A local caching nameserver is highly recommended. If you already
                        have one that's working OK, there's no pressing need to replace it.


                        >
                        > Is there a way to verify that everything is working properly?

                        Watch the logs for errors or unexpected behavior.




                        -- Noel Jones
                      • James Griffin
                        ... using a local DNS server has worked brilliantly for me. It s trivial to set up and provides excellent benefits. -- James Griffin: jmz at kontrol.kode5.net
                        Message 11 of 23 , Aug 31, 2013
                          !-- On Fri 30.Aug'13 at 20:27:43 BST, Grant (emailgrant@...), wrote:
                          > >> I grep'ed the mail logs for dnsblog and got a huge number of these:
                          > >>
                          > >> [postfix/postscreen] warning: psc_dnsbl_request: connect to
                          > >> private/dnsblog service: No such file or directory
                          > >
                          > > Looks as if you've found the problem.
                          > >
                          > > Make sure your master.cf has an entry like:
                          > >
                          > > dnsblog unix - - n - 0 dnsblog
                          >
                          > Thank you. I added it and restarted postfix and started to get errors
                          > like these:
                          >
                          > [postfix/dnsblog] warning: dnsblog_query: lookup error for DNS query
                          > MASKED.list.dnswl.org: Host or domain name not found. Name service
                          > error for name=MASKED.list.dnswl.org type=A: Host not found, try again
                          >
                          > I did some searching and I think this was due to my use of Google's
                          > DNS resolvers (8.8.8.8 and 8.8.4.4). I added my host's DNS resolver
                          > first in the list and the errors seem to have stopped. Is that a good
                          > config?
                          >
                          > I also read a recommendation to set up a caching nameserver like
                          > unbound on the same machine as postfix. Is that the right thing to
                          > do?
                          >
                          > Is there a way to verify that everything is working properly?
                          >
                          > - Grant


                          using a local DNS server has worked brilliantly for me. It's trivial to
                          set up and provides excellent benefits.

                          --


                          James Griffin: jmz at kontrol.kode5.net

                          A4B9 E875 A18C 6E11 F46D B788 BEE6 1251 1D31 DC38
                        • Grant
                          ... I m on Gentoo and I use the etc-update script to update config files after upgrading. Should dnsblog be uncommented in a default master.cf? If so I may
                          Message 12 of 23 , Sep 1 1:52 AM
                            >>>> I grep'ed the mail logs for dnsblog and got a huge number of these:
                            >>>>
                            >>>> [postfix/postscreen] warning: psc_dnsbl_request: connect to
                            >>>> private/dnsblog service: No such file or directory
                            >>>
                            >>> Looks as if you've found the problem.
                            >>>
                            >>> Make sure your master.cf has an entry like:
                            >>>
                            >>> dnsblog unix - - n - 0 dnsblog
                            >>
                            >> Thank you. I added it and restarted postfix and started to get errors
                            >> like these:
                            >
                            > Postfix always add missing master.cf entries automatically as part
                            > of the upgrade procedure. You can break this by restoring an old
                            > file after the upgrade.

                            I'm on Gentoo and I use the etc-update script to update config files
                            after upgrading. Should dnsblog be uncommented in a default
                            master.cf? If so I may need to file a Gentoo bug.

                            >> Is there a way to verify that everything is working properly?
                            >
                            > Watch the logs for errors or unexpected behavior.

                            I see that the following message received a 450. The IP is not listed
                            at dnswl.org and when I look it up it appears to come from China. Is
                            this a spoof?

                            NOQUEUE: reject: RCPT from [183.8.195.26]:3302: 450 4.3.2 Service
                            currently unavailable; from=<MASKED@...>,
                            to=<MASKED@...>, proto=ESMTP, helo=<gmail.com>

                            - Grant
                          • James Griffin
                            ... The ip 183.8.195.26 is certainly a spammer. Just looked it up using whois nad host(1). -- James Griffin: jmz at kontrol.kode5.net A4B9 E875 A18C 6E11 F46D
                            Message 13 of 23 , Sep 1 2:18 AM
                              !-- On Sun 1.Sep'13 at 9:52:50 BST, Grant (emailgrant@...), wrote:
                              > >>>> I grep'ed the mail logs for dnsblog and got a huge number of these:
                              > >>>>
                              > >>>> [postfix/postscreen] warning: psc_dnsbl_request: connect to
                              > >>>> private/dnsblog service: No such file or directory
                              > >>>
                              > >>> Looks as if you've found the problem.
                              > >>>
                              > >>> Make sure your master.cf has an entry like:
                              > >>>
                              > >>> dnsblog unix - - n - 0 dnsblog
                              > >>
                              > >> Thank you. I added it and restarted postfix and started to get errors
                              > >> like these:
                              > >
                              > > Postfix always add missing master.cf entries automatically as part
                              > > of the upgrade procedure. You can break this by restoring an old
                              > > file after the upgrade.
                              >
                              > I'm on Gentoo and I use the etc-update script to update config files
                              > after upgrading. Should dnsblog be uncommented in a default
                              > master.cf? If so I may need to file a Gentoo bug.
                              >
                              > >> Is there a way to verify that everything is working properly?
                              > >
                              > > Watch the logs for errors or unexpected behavior.
                              >
                              > I see that the following message received a 450. The IP is not listed
                              > at dnswl.org and when I look it up it appears to come from China. Is
                              > this a spoof?
                              >
                              > NOQUEUE: reject: RCPT from [183.8.195.26]:3302: 450 4.3.2 Service
                              > currently unavailable; from=<MASKED@...>,
                              > to=<MASKED@...>, proto=ESMTP, helo=<gmail.com>

                              The ip 183.8.195.26 is certainly a spammer. Just looked it up using whois
                              nad host(1).

                              --


                              James Griffin: jmz at kontrol.kode5.net

                              A4B9 E875 A18C 6E11 F46D B788 BEE6 1251 1D31 DC38
                            • Grant
                              ... Thanks James. This is all very cool. A blacklist (zen.spamhaus.org), a whitelist (list.dnswl.org), and a greylist . 2.11 looks to be a fantastic
                              Message 14 of 23 , Sep 1 3:09 AM
                                >> >>>> I grep'ed the mail logs for dnsblog and got a huge number of these:
                                >> >>>>
                                >> >>>> [postfix/postscreen] warning: psc_dnsbl_request: connect to
                                >> >>>> private/dnsblog service: No such file or directory
                                >> >>>
                                >> >>> Looks as if you've found the problem.
                                >> >>>
                                >> >>> Make sure your master.cf has an entry like:
                                >> >>>
                                >> >>> dnsblog unix - - n - 0 dnsblog
                                >> >>
                                >> >> Thank you. I added it and restarted postfix and started to get errors
                                >> >> like these:
                                >> >
                                >> > Postfix always add missing master.cf entries automatically as part
                                >> > of the upgrade procedure. You can break this by restoring an old
                                >> > file after the upgrade.
                                >>
                                >> I'm on Gentoo and I use the etc-update script to update config files
                                >> after upgrading. Should dnsblog be uncommented in a default
                                >> master.cf? If so I may need to file a Gentoo bug.
                                >>
                                >> >> Is there a way to verify that everything is working properly?
                                >> >
                                >> > Watch the logs for errors or unexpected behavior.
                                >>
                                >> I see that the following message received a 450. The IP is not listed
                                >> at dnswl.org and when I look it up it appears to come from China. Is
                                >> this a spoof?
                                >>
                                >> NOQUEUE: reject: RCPT from [183.8.195.26]:3302: 450 4.3.2 Service
                                >> currently unavailable; from=<MASKED@...>,
                                >> to=<MASKED@...>, proto=ESMTP, helo=<gmail.com>
                                >
                                > The ip 183.8.195.26 is certainly a spammer. Just looked it up using whois
                                > nad host(1).

                                Thanks James. This is all very cool. A blacklist (zen.spamhaus.org),
                                a whitelist (list.dnswl.org), and a "greylist". 2.11 looks to be a
                                fantastic release for easily-configured anti-spam measures. I'm just
                                not getting spam anymore and I don't think I'm rejecting legitimate
                                mail either.

                                Thanks to all,
                                Grant
                              • Wietse Venema
                                ... As distributed by me, the inet smtpd service is active, and all postscreen-related services are commented out. smtp inet n - n -
                                Message 15 of 23 , Sep 1 4:54 AM
                                  Grant:
                                  > I'm on Gentoo and I use the etc-update script to update config files
                                  > after upgrading. Should dnsblog be uncommented in a default
                                  > master.cf? If so I may need to file a Gentoo bug.

                                  As distributed by me, the 'inet' smtpd service is active, and all
                                  postscreen-related services are commented out.

                                  smtp inet n - n - - smtpd
                                  #smtp inet n - n - 1 postscreen
                                  #smtpd pass - - n - - smtpd
                                  #dnsblog unix - - n - 0 dnsblog
                                  #tlsproxy unix - - n - 0 tlsproxy

                                  As documented, when you turn on postcreen you turn off the 'inet'
                                  smtpd service and turn on all the postscreen-related services:

                                  #smtp inet n - n - - smtpd
                                  smtp inet n - n - 1 postscreen
                                  smtpd pass - - n - - smtpd
                                  dnsblog unix - - n - 0 dnsblog
                                  tlsproxy unix - - n - 0 tlsproxy

                                  Details in http://www.postfix.org/POSTSCREEN_README.html#config

                                  Wietse
                                • Grant
                                  ... Understood. In that case I don t think Gentoo s config updater is meant to handle this sort of thing (conditionals) and no bug report there is necessary.
                                  Message 16 of 23 , Sep 1 5:13 AM
                                    > Grant:
                                    >> I'm on Gentoo and I use the etc-update script to update config files
                                    >> after upgrading. Should dnsblog be uncommented in a default
                                    >> master.cf? If so I may need to file a Gentoo bug.
                                    >
                                    > As distributed by me, the 'inet' smtpd service is active, and all
                                    > postscreen-related services are commented out.
                                    >
                                    > smtp inet n - n - - smtpd
                                    > #smtp inet n - n - 1 postscreen
                                    > #smtpd pass - - n - - smtpd
                                    > #dnsblog unix - - n - 0 dnsblog
                                    > #tlsproxy unix - - n - 0 tlsproxy
                                    >
                                    > As documented, when you turn on postcreen you turn off the 'inet'
                                    > smtpd service and turn on all the postscreen-related services:
                                    >
                                    > #smtp inet n - n - - smtpd
                                    > smtp inet n - n - 1 postscreen
                                    > smtpd pass - - n - - smtpd
                                    > dnsblog unix - - n - 0 dnsblog
                                    > tlsproxy unix - - n - 0 tlsproxy
                                    >
                                    > Details in http://www.postfix.org/POSTSCREEN_README.html#config

                                    Understood. In that case I don't think Gentoo's config updater is
                                    meant to handle this sort of thing (conditionals) and no bug report
                                    there is necessary.

                                    - Grant
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