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Re: postfix delivery delay causing duplicate mail delivery

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  • Viktor Dukhovni
    ... This is not the case, the queue-manager processed the message as soon as it entered the queue. ... Wrong timeouts (output not input) and unwise tuning.
    Message 1 of 11 , Nov 1, 2012
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      On Thu, Nov 01, 2012 at 08:37:43AM +0800, Fred Ho wrote:

      > The problem happened intermittently with different senders and
      > I found it usually involved multiple recipients and have attachments.

      > What I don't understand is Postfix qmgr took over 2 hours later
      > to process that stucked mail while the ISP has retried the mail
      > 2nd time in less than an hour and was delivered successfully. I
      > don't see any deferred mails though.

      This is not the case, the queue-manager processed the message as
      soon as it entered the queue.

      > I deliberately tune up the timeouts to see if it's the problem.

      Wrong timeouts (output not input) and unwise tuning. Revert to default
      settings.

      As I said before:

      > You can add one of the more frequent problem senders to "debug_peer_list"
      > and we'll see when the SMTP server receives ".<CRLF>". Otherwise you
      > need to capture a tcpdump "pcap" file of the problem transactions and
      > look at packet timestamps.

      --
      Viktor.
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