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Remote SMTP error code - missing



Hi all,

I'm quite frequently receiving permanent delivery failures when sending mail to a particular remote host even though apparently they're responding with a temporary 45x error.  The log entry shows a missing code:

2007-11-26 09:55:26.771462500 delivery 252542: failure: 1.2.3.4_failed_after_I_sent_the_message./Remote_host_said:_Read_timed_out/

Now I'm assuming they're at fault here but I need to prove this easily and I'm not sure how to do so without intercepting and logging the smtp sessions (which will take a while as it only happens a few times a day).

Any ideas?

Thanks.

Matt.