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Postfix and Queues - FreeBSD

Hi *, I have little, but not annoying problem with Postfix and queuing management. When two or more big (understand >2 MB) emails are in active queue, Postfix is trying to deliver them simultaneously. But moth ago began to apear following message in /var/log/mail : 5BCED8EFE3* 4534286 Fri Mar 25 14:25:35 cz (lost connection with mailserver.domain.com [aa.bb.cc.dd] while sending message body) ^^ this message is in defer queue and wait for its time, when next try to deliver comes. During this time comes another big email from local user, which get stucked in defer queue too. The link start to ...

  1. #1

    Default Postfix and Queues

    Hi *,

    I have little, but not annoying problem with Postfix and queuing
    management. When two or more big (understand >2 MB) emails are in active
    queue, Postfix is trying to deliver them simultaneously. But moth ago
    began to apear following message in /var/log/mail :

    5BCED8EFE3* 4534286 Fri Mar 25 14:25:35 cz
    (lost connection with mailserver.domain.com [aa.bb.cc.dd] while sending
    message body)

    ^^ this message is in defer queue and wait for its time, when next try
    to deliver comes. During this time comes another big email from local
    user, which get stucked in defer queue too. The link start to have very
    high load of outgoing mail traffic, but all of them are unsuccesfully
    delivered.

    Well, is there any chance to reduce queue to one mail in active queue ?

    The system runs postfix-19991231pl08-29 - I know its very old.

    Thank you in advance.

    Vladimir

    Vladimir Guest

  2. #2

    Default Re: Postfix and Queues

    Vladimir Dvorak wrote:
     

    I found solution.

    There is (in front of this mailserver) OpenBSD firewall with "scrub in
    all". Problem appears, when this messages are targeted to Microsoft MX.
    MS servers badly handle with IP headers and sets "Dont fragment" bit,
    when this packet is fragmented. :-)

    Excerpt from man pf.conf:
    "Some operating systems are known to generate fragmented packets with
    the dont-fragment bit set. "

    If you want to avoid this problem, leave "scrub in all" and use "scrub
    in no-df".

    If you have another solution, you are welcome! :-)

    Vladimir Dvorak
    --
    * VDSOFT.ORG org *
    * (+420) 602 944 941 http://www.vdsoft.org *


    Vladimir Guest

  3. #3

    Default Re: Postfix and Queues

    Vladimir Dvorak wrote:
     

    Vladimir,

    I know you can do this in qmail, but not obvious way for me to do with
    with Postfix. Perhaps you can find the Postfix list and ask there?
    Vietse is very helpful -- he will scold you as to just which part of the
    doentation you should have read before asking him. :)

    Sincerely,
    -danny
    Danny Guest

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