[exim-dev] [Bug 3042] New: EXim closes connection direct aft…

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Author: Exim Bugzilla
Date:  
To: exim-dev
Subject: [exim-dev] [Bug 3042] New: EXim closes connection direct after end of DATA (.)
https://bugs.exim.org/show_bug.cgi?id=3042

            Bug ID: 3042
           Summary: EXim closes connection direct after end of DATA (.)
           Product: Exim
           Version: 4.96+
          Hardware: Sun
                OS: Solaris
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Delivery in general
          Assignee: unallocated@???
          Reporter: lt@???
                CC: exim-dev@???


Hi Maintainers,

I have six exim 4.96.1 installations with very different configs, but same
behaviour.
All on Solaris 11 x86.

I am opening the bug so late because it is not easy to say anything about this
problem except that the Exim disconnects after the end of DATA (.) for some(!)
mails. It is independent of the recipient of the mail. Some mails to the
recipient work, others don't, but the mail that doesn't work fails every time I
try to send it.
The problem occurs both with mails to be stored locally and with mails to be
forwarded.
There is nothing in the log file for the problematic mail except that there is
a connection from the remote host. Nothing else.
I have no coredumps, nothing from the paniclog. I am at a bit of a loss as to
how to open this bug.

At one site I have external and internal exim 4.96.1 instances, both on Solaris
11 x86 and I have found mails that are accepted by the external mail servers,
but failed to forward to the internal exim with this message:
2023-10-22 14:00:26.393 [26582] 1quX8E-0006uK-2q H=mail.domain.tld
[172.17.12.42]:25: Remote host closed connection in response to end of data

This is how a remote postfix sees the problem:
Remote Server returned '554 4.4.2 < #4.4.2 X-Postfix; lost connection with
othermail.domain.tld while sending end of data -- message may be sent more than
once>

There is no different behaviour when I build the lookups static instead of
dynamic.

Any suggestions on debugging are welcome!

Greetings,
Lars

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