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postfix-users: Re: Queue full of double-bounce

Re: Queue full of double-bounce

From: Wietse Venema <wietse_at_nospam>
Date: Mon Oct 11 2010 - 11:54:13 GMT
To: Postfix users <postfix-users@postfix.org>

Patric Falinder:
> Hi,
>
> Recently I've noticed that my mailqueue is filled up with doube-bounce
> messages that won't go away.
> I can't remember it being this way since the beginning and I just
> noticed it a couple of days ago.
>
> Right now I have 193 messages in the queue and they're all from
> double-bounce.
> They are only in the queue for the time specified in
> maximal_queue_lifetime that I have set to 3 days.
> Before it was 5 days and then I had over 1000 messages in the queue..
>
> If I do a postcat on a message I get this:
>
> *** ENVELOPE RECORDS /var/spool/postfix/active/6322B10A46C ***
> message_size: 256 236 1
> 0 256
> message_arrival_time: Sat Oct 9 13:59:08 2010
> create_time: Sat Oct 9 13:59:08 2010
> named_attribute: log_message_origin=local
> named_attribute: trace_flags=256

That is an address probe (triggered by the use of reject_unverified_sender
or reject_unverified_recipient). Postfix does one delivery attempt
and throws them away.

Apparently your Postfix queued a lot of address probes a few days
ago. If the messages are in the incoming or deferred queue, then
your queue manager isn't waking up to grab new mail. This can be
a symptom of broken timer support in virtualized environments.

        Wietse