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Re: Connection Issues

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  • Noel Jones
    ... Is there some reason the above IP is included in your error report? ... A connect/disconnect with no other logs strongly suggests that the receiving
    Message 1 of 4 , Jan 4, 2013
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      On 1/4/2013 9:19 AM, Viaduct Productions wrote:
      > Hi folks.
      >
      > I'm using some middleware to generate an email that's sent to Mac OSX Server's installation of postfix. The email never gets through, and I don't know why. I've had some suggestions which I will post below, but nothing seems to work. I am not authenticating, and I've tried authentication which does not work either. I don't know postfix at all, so I'm trying to see what could be the problem by posting these tidbits of feedback and logs here. Any input appreciated. I'm stumped as to why this isn't working.
      >
      > 192.168.1.4 is my workstation
      > 192.168.1.7 is the server on 10.8.2 Server
      >
      > SMTP log from Server.app
      > Jan 3 15:23:03 alpha.mydomain.com postfix/postscreen[4262]: DNSBL rank 2 for [188.2.165.91]:4368
      > Jan 3 15:23:04 alpha.mydomain.com postfix/smtpd[4213]: connect from cable-188-2-165-91.dynamic.sbb.rs[188.2.165.91]

      Is there some reason the above IP is included in your error report?

      > Jan 3 15:23:04 alpha.mydomain.com postfix/postscreen[4262]: CONNECT from [192.168.1.4]:63328 to [192.168.1.7]:25
      > Jan 3 15:23:04 alpha.mydomain.com postfix/postscreen[4262]: WHITELISTED [192.168.1.4]:63328
      > Jan 3 15:23:04 alpha.mydomain.com postfix/smtpd[4325]: connect from unknown[192.168.1.4]
      > Jan 3 15:23:04 alpha.mydomain.com postfix/smtpd[4325]: disconnect from unknown[192.168.1.4]


      A connect/disconnect with no other logs strongly suggests that the
      receiving postfix is not the problem. Suspects include a
      configuration error on the sending client, a firewall issue, or a
      networking problem.

      Suggestions:
      - Test the connection from your workstation to postfix with telnet.
      If that works, it eliminates firewall or networking as possible
      issues, and points to the sending client software.
      - Look for errors in the sending software; hopefully it has useful logs.
      - Record a session with tcpdump to see details of what's happening
      on the wire. http://www.postfix.org/DEBUG_README.html#sniffer


      Authentication and/or adding the workstation IP to mynetworks is
      only useful if postfix is rejecting the mail. This doesn't seem to
      be the case here since postfix logs all rejections.



      -- Noel Jones
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