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295008Re: email from comcast.net is bouncing

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  • Grant
    Aug 27, 2013
    • 0 Attachment
      >> >> >> 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
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