[Exim] Queue processing optimization

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Autor: Christian Hertel
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A: exim-users
Assumpte: [Exim] Queue processing optimization
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Hello folks,

I'm trying to optimize exim queue processing on our main mailserver and
therefore experimented with the exim timeout settings and retry rules.

In this context I don't understand the following behaviour:

If a mail to a domain we relay for could not be delivered to it's final
destination because of an '554 User unknown' error, we generate the
bounce message. But if the origin sender address was faked and our
bounce message could also not be delivered because of a '554 User
unknown' error, why does exim not discard this bounce immediately, and
holds it in the queue? A 5xx is a permanent error so why does exim
thinks this mail could be delivered sometimes again?

Is there any possibility to configure this behaviour?

I configured 'ignore_bounce_errors_after = 6h' but this should not apply
to mails frozen because of a permanent delivery error.


Below is the appropriate log output:

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2004-08-20 09:51:14 1By4B6-00078E-GJ ** swcay@???
<SWCAY@???> R=lookup T=remote_smtp: SMTP error from remote mailer
after end of data: host mx2.mail.yahoo.com [64.156.215.8]: 554 delivery
error: dd This user doesn't have a yahoo.com account (swcay@???)
[-5] - mta297.mail.scd.yahoo.com
2004-08-20 09:51:14 1By4B6-00078E-GJ Frozen (delivery error message)

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Cheers,

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Christian Hertel
Technik

infoServe GmbH
Nell-Breuning-Allee 6
D-66115 Saarbruecken

T: (0681) 8 80 08 - 0
F: (0681) 8 80 08 - 33
www.infos.de
E: c.hertel@???
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