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Thread: 451 4.7.1 Service unavailable - try again later (in reply to end of DATA....

  1. #1
    simonb is offline Trained Alumni
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    Default 451 4.7.1 Service unavailable - try again later (in reply to end of DATA....

    Server version: 7.1.2_GA_3268.UBUNTU10_64 UBUNTU10_64 FOSS edition

    We are getting some emails returned as undeliverable by our server with the following message,

    Code:
    host mail.our-zimbra-server-domain.com[xx.xx.xx.xx] said: 451
       4.7.1 Service unavailable - try again later (in reply to end of DATA
       command)
    My first guess was that the emails had unusually long attachements that was causing a timeout before the DATA section had completed. However people are reporting that their emails to us are bounced with a size less than 2MB.

    I put a watch on the zimbra.log for anything with the word "timeout" in it. There are lots of messages like...
    Code:
    May 14 17:27:48 mail postfix/smtpd[17009]: timeout after END-OF-MESSAGE from localhost[127.0.0.1]
    ...and a few like...
    Code:
    May 14 05:57:31 mail postfix/smtpd[16856]: timeout after DATA (7008 bytes) from unknown[.....
    However none of these timeout messages involves one of the IP addresses involved in a sender who has confirmed they were getting their email bounced from us. There doesn't seem to be anything obvious in the logs when it happens, although I am still searching around the date/time of the rejections.

    Simply egrepping for "[^0-9]451[^0-9]" doesn't show anything except an unlrelated mention of the number "451".

    Our Zimbra server is running on a VSpere 5/SAS/SATA environment on a Dell 2950.

    I would appreciate some ideas on what might be causing these timeouts and where they would be reported if not in zimbra.log.

  2. #2
    simonb is offline Trained Alumni
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    Default

    OK, now I've had some more time to look at the issue, I've found the occurance in the log files.

    Code:
    May 14 11:06:11 mail postfix/cleanup[29709]: warning: milter inet:127.0.0.1:7026: can't read SMFIC_HEADER reply packet header: Success
    May 14 11:06:11 mail postfix/cleanup[29709]: 4381A2017D3: milter-reject: END-OF-MESSAGE from gateway04.someothermailserver.com[xx.xx.xx.xx]: 4.7.1 Service unavailable - try again later; from=<don@othermail.com> to=<me@ourzimbra.com> proto=ESMTP helo=<gateway04.someothermailserver.com>
    May 14 11:06:11 mail postfix/smtpd[27688]: disconnect from gateway04.someothermailserver.com[xx.xx.xx.xx]
    I have found another thread regarding this issue.
    Adjusting SMTP/milter timeout?

    I have tried the solution suggested by FritzBrause,
    Code:
    zmlocalconfig -e milter_thread_keep_alive_time=120
    zmlocalconfig -e milter_write_timeout=30
    zmcontrol restart
    Let's see if it helps.

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