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Thread: Slow email delivery

  1. #1
    Join Date
    Aug 2008
    Rep Power

    Default Slow email delivery

    We are experiencing an issue whereby some users are receiving emails after a very long time period. Mails are being sent via a PHP application.

    I want to understand if what I am seeing is normal & expected.

    Below is the message header for one such email (names changed to protect the innocent). It seems to me that it took 27 minutes for my server to send the email. Is that correct? Then it took the recipients mail system another
    18 minutes to deliver the message to the inbox. Is that assumption correct?

    And, if I'm correct, are there some obvious things that we can do to deliver email faster?

    Thanks for your (expert) eyes!

    Message headers follow

    Received: from (x.y.z.a) by (x.y.z.a) with Microsoft SMTP Server (TLS) id; Thu, 14 Aug 2008 15:00:47 -0500

    Received: from unknown [x.y.z.a] (EHLO by (mxl_mta-5.6.1-1) with ESMTP id (envelope-from <>); Thu, 14 Aug 2008 14:00:29 -0600 (MDT)

    Received: from localhost (localhost.localdomain []) by (Postfix) with ESMTP id blah for
    <>; Thu, 14 Aug 2008 16:02:27 -0400 (EDT)
    X-Virus-Scanned: amavisd-new at
    X-Spam-Flag: NO
    X-Spam-Score: -2.599
    X-Spam-Status: No, score=-2.599 tagged_above=-10 required=6.6
    tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001]

    Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id blah for <>; Thu, 14 Aug 2008 16:02:25 -0400 (EDT)

    Received: by (Postfix, from userid 33) id id_num; Thu,
    14 Aug 2008 16:02:25 -0400 (EDT)
    To: first last <>
    Subject: MessageSubj
    MIME-Version: 1.0
    From: First Last <>
    Content-Type: multipart/alternative;

    Message-ID: <>
    Date: Thu, 14 Aug 2008 16:02:25 -0400
    X-Spam: exempt
    X-MAIL-FROM: <>
    X-SOURCE-IP: [x.y.z.a]
    X-MS-Exchange-Organization-SenderIdResult: None
    Received-SPF: None ( does not designate permitted sender hosts)
    X-MS-Exchange-Organization-SCL: 0
    X-MS-Exchange-Organization-PCL: 2
    DV:3.3.5705.600;SID:SenderIDStatus None;OrigIP:

  2. #2
    Join Date
    Jul 2007
    Rep Power


    you're going to get a lot more pertannent information from the mta logs on both the zimbra server and the server running the php application. are their clocks syncronized as well?

  3. #3
    Join Date
    Aug 2008
    Rep Power


    Yes the clocks are sync'd. So, are you saying that there does seem to be a problem and that I should confirm the delay in zimbra's mailbox.log?

  4. #4
    phoenix is offline Zimbra Consultant & Moderator
    Join Date
    Sep 2005
    Vannes, France
    Rep Power


    Why do you think those messages show a delay? Unless I'm missing something obvious, the messages are all showing different timezones and appear to show a delivery time of 2.5 minutes from the first headers to the last one you posted. As bdial mentioned, you'll find full information in the log files or you can use zmmsgtrace.
    Last edited by phoenix; 08-15-2008 at 05:07 AM.


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