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Mails not arriving, SMTP communication incomplete

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Mails not arriving, SMTP communication incomplete - 25.Oct.2012 12:13:00 PM

pabjv

Posts: 1
Joined: 10.Nov.2008
Status: offline

Exchange 2003 SP2
Windows 2003R2 fully patched
Behind a ISA 2006 server

Lately at a client some messages don't arrive. Checking the SMTP logs I notice that the communication seems incomplete. When I check the messages that don't arrive I notice that the DATA portion of the SMTP communication is missing. On succesful messages I see EHLO, MAIL, RCPT, DATA and QUIT. The messages that don't arrive are missing the DATA part. They look like this:

EHLO host1.myisp.com
MAIL customer@HisCompany.com
RCPT Me@MyCompany.com
QUIT host1.myisp.com
EHLO host2.myisp.com
MAIL customer@HisCompany.com
RCPT Me@MyCompany.com
QUIT host2.myisp.com

No DATA part. Anybody seen this before? The server shows no errors.