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Undeliverable Mail (Error 4.4.7 and 5.5.0)

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  • Undeliverable Mail (Error 4.4.7 and 5.5.0)

    Our office has a Win2K3 DC/DNS server and another Win2K3 server hosting MS Exchange 2003.

    Recently our users have been getting some undeliverable mail messages from our MX Exchange 2003 Administrator. Specifically 4.4.7 and 5.5.0 error messages. What's odd is that some e-mails go out fine, but others don't.

    We've checked the firewall logs and it appears that port 25 SMTP requests are repeatedly being sent by the mail server to the domains (or IP addresses seen in the logs) we have been having trouble with.

    The other fix we tried was from this link: http://support.microsoft.com/default...b;en-us;828263. Still, the problem persists.

    Any thoughts? Thanks

  • #2
    What firewall do you have?
    You said recently? What changes have been made since then??
    MCSE w2k
    MCSA w2k - MCSA w2k MESSAGING
    MCDBA SQL2k

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    • #3
      Watchguard X700. No other changes have been made since. The firewall was put into place 7 days ago.

      Thoughts?

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