Mailing List Archive

[Bug 2408] New: Exim 4.92 generating spurious "Delay reason:" for delayed messages
https://bugs.exim.org/show_bug.cgi?id=2408

Bug ID: 2408
Summary: Exim 4.92 generating spurious "Delay reason:" for
delayed messages
Product: Exim
Version: 4.92
Hardware: x86-64
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Delivery in general
Assignee: nigel@exim.org
Reporter: dpc22@cam.ac.uk
CC: exim-dev@exim.org

We upgraded from Exim 4.91 to 4.92 last week following the security alert.
The Exim configuration hasn't otherwise changed at all.

One of my colleagues just noticed an oddity about a delay warning that
she received after a message was stuck for 24 hours. Namely:

"Subject: Warning: message 1hb4R5-000tku-K5 delayed 24 hours

This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 24 hours on the queue on ppsw-31.csi.cam.ac.uk.

The message identifier is: 1hb4R5-000tku-K5
The date of the message is: Wed, 12 Jun 2019 15:41:11 +0100 (BST)
The subject of the message is: RE: Your internal webserver

The address to which the message has not yet been delivered is:

csirt@uis.cam.ac.uk

Delay reason:
lookup of host "ms1.ad.csx.cam.ac.uk" failed in internal_redirect_two
router
"

Which is all correct and proper apart from the "Delay reason:" at the end.

csirt@uis.cam.ac.uk expands to 6 target accounts. If I test each of the six
addresses by hand using exinext, the only error that I see is:

$ /opt/exim/bin/exinext XXX@hermes.cam.ac.uk
Route: XXX@hermes.cam.ac.uk error -44:
H=cyrus-7a-intramail.csi.cam.ac.uk [192.168.128.7]:
SMTP error from remote mail server after RCPT TO:<XXX@hermes.cam.ac.uk>:
452 4.2.2 Over quota
first failed: 12-Jun-2019 12:07:28
last tried: 14-Jun-2019 11:17:27
next try at: 14-Jun-2019 12:17:27

This particular individual runs out of quota quite frequently, so we are
used to seeing such warnings.

The error that is actually reported:

lookup of host "ms1.ad.csx.cam.ac.uk" failed in internal_redirect_two router

appears to correspond to a different @uis.cam.ac.uk email address, which is
indeed broken as it expands to a hostname which has now disappeared.

However I can't see any overlap between that address and the six separate
email addresses which "csirt@uis.cam.ac.uk" expands to. The behaviour was
different with Exim 4.91 last week. Consequently I think this is a bug.

The problem appears to be specific to this particular email address
"csirt@uis.cam.ac.uk": I have chased down a number of other bounce messages
which have been generated in the last week and they all look fine.

I'm happy to provide further information. At the moment it isn't clear what
would actually be useful in a bug report.

Just as an aside: I reported a problem with delay_warning in 4.91:

https://bugs.exim.org/show_bug.cgi?id=2341

which should be fixed in 4.92. It seems unlikely that this is related, but
it seemed sensible to at least mention it.

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