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Thread: Unable to send big (4Mb) attachment without webmail

  1. #1
    sadiq007 is offline Special Member
    Join Date
    May 2009
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    Question Unable to send big (4Mb) attachment without webmail

    From Webmail i am able to send attachment up to 15 Mb, but from Outlook i can send attachment only up to 3Mb, if i send attachment more then 4Mb size? then i am getting error
    "451 4.7.1 Service Unavailable - try again later Server Error:451"

    while looking zimbra.log
    Jun 21 17:35:45 mail postfix/cleanup[17046]: 6B9007DC01CC: milter-reject: END-OF-MESSAGE from unknown[]: 4.7.1 Service unavailable - try again later; from=<> to=<> proto=ESMTP helo=<administrator>

    (i am having zimbra 7.1.0 64 bit)
    what to give at Milter Server Bind Address: Under Server settings-MTA-Milter Server ??

  2. #2
    manolopm is offline Junior Member
    Join Date
    Jul 2011
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    Default A possible solution


    Seems to be a timeout between the milter server and postfix. When the cleanup server pass throught the conections it cuts off them.

    We solved it adding:



    Let us know if this solve it for you

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