postfix-users October 2010 archive
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postfix-users: Re: Queue full of double-bounce

Re: Queue full of double-bounce

From: Patric Falinder <patric.falinder_at_nospam>
Date: Mon Oct 11 2010 - 14:27:13 GMT
To: Postfix users <>

Wietse Venema skrev 2010-10-11 14:44:
> Wietse Venema:
>> 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.
> Another observation:
> Apparently the low-frequency $queue_run_delay (300s) timer still
> works, so the queue manager picks up one message every 300s, but
> your system's ZERO-DELAY timer support is broken, so the queue
> manager does not pick up the next message immediately as it does
> everywhere else.
> Thus, you're limited to about 288 deliveries per day.
> What OS platform is this? What about virtualization? What about
> tick-less timer support? What Postfix version, any "improvements"
> made by local users or helpful vendors? RedHat used to be pretty
> good at breaking Postfix in surprising ways.
> Wietse

I'm running Debian Lenny x64 with Postfix 2.5.5 with VDA patch.
It's virtualized on a VMWare ESX server.
Don't really know what tick-less timer support is so I guess I don't use
it unless it's standard in Debian!?

How do I fix the system's ZERO-DELAY timer?

Thanks a lot for the help Wietse!