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Exim 500 Firewall Error

Discussion in 'E-mail Discussion' started by Chocobo22687, Oct 27, 2007.

  1. Chocobo22687

    Chocobo22687 Member

    Oct 23, 2006
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    We currently have 2 servers, one being the primary and one purely being a backup DNS and Mail server (running DNSonly and Exim).

    Everything works as expected when the primary server is unavailable the mail is sent to the backup mail server, and forwarded on once the primary is back online.

    The only issue we have is that the error message below is randomly generated from some emails.

    When the primary is back online and the secondaries mail queue processed 1 in 10 messages (roughly) is getting dropped at the secondary and NDR'd with that error, the rest are being sent through without any problems and being received and delivered at the primary.

    There are no blocks in the receiving servers software firewall (Configserv's CSF) and the IP's are white listed.

    Anyone have any further ideas? Looking around online hasn't really drawn anything conclusive.

    Thanks in advance!

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