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Debugging rejected mail

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Subject: Debugging rejected mail
From: Oliver Welter <mail@oliwel.de>
Date: Wed, 11 Apr 2007 19:19:34 +0200
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Hi,

I am running a qmail toaster with qmail-scanner / clamav/ spamassassin
and have problem with rejected mails.

My traffic accounting shows up a connection to my SMTP port with a flow
of approx 14MB. This connection returns every 10 minuntes. Meanwhile we
figured out that it was an microsoft exchange server that tried to
resend a mail of around 10MB.

I have set databytes to 25MB, the server announces this correctly on a
EHLO command - so I assume it is set correctly:

ehlo
250-mail.xxxxxxx.xx - Nice to see you - Note: max mail size is 25MB
250-STARTTLS
250-PIPELINING
250-8BITMIME
250-SIZE 26214400
250 AUTH LOGIN PLAIN

So, the question is, why is the mail rejected and where can I find
information about this conection? in the qmail-send log the whole event
does not show up ( I assume only successful processed events show up here).

I tried to catch some data by capturing the traffic, but its a hard work
to do so as a lot of information must be correlated by hand.....

Oliver
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