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Mail from particular hosts not being delivered

Asked by NothingSirius in Exchange Email Server, Simple Mail Transfer Protocol (SMTP)

Tags: Microsoft Exchange 2003

A have a fully operational Exchange 2003 system, been up and working for a couple years with no problems. Suddenly I have mail from one particular host not arriving in inboxes. It shows in the SMTP log, I can see it actually successfully hitting the system, but then it vanishes without a trace. I have whitelisted the organization, so it doesn't seem to be that. And, I can telnet a manual delivery with that host name as it's rcpt from: input and it successfully makes it into the inbox.

Ideas? I'm fresh out.
[+][-]11/04/09 07:11 PM, ID: 25746446Expert Comment

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[+][-]11/04/09 07:38 PM, ID: 25746562Expert Comment

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[+][-]11/04/09 10:06 PM, ID: 25747084Author Comment

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[+][-]11/05/09 05:16 AM, ID: 25749037Expert Comment

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[+][-]11/06/09 07:40 AM, ID: 25760017Author Comment

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