Mailing List Archive: [Bug 681] exim hangs when processing message from server with lot of MX records

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http://bugs.exim.org/show_bug.cgi?id=681

--- Comment #1 from Dave Evans <exim-bugzilla-20070119@djce.org.uk> 2008-03-18 09:09:53 ---
Most likely it's just taking a long time to look up the relevant DNS records -
an "MX" lookup for the domain in question, then an "A" (or maybe "ANY") lookup
for each MX thus found.

I just tried this with the "mx" command (from the Ubuntu "host" package), and
the lookups are very slow. This would make exim appear to hang.

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http://bugs.exim.org/show_bug.cgi?id=681

Tony Finch <fanf@exim.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID

--- Comment #2 from Tony Finch <fanf@exim.org> 2008-03-18 15:02:33 ---
Yes, Dave is right.

The mistake is that you should not do strict anti-spam checks on connections
from fetchmail.

For connections from a normal SMTP sender, Exim and/or the sender will
eventually time out and Exim will log the loss of the connection.

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