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We're running Exchange 2010 on Server 2008 R2. All updates are installed.

We have a domain that cannot send us mail. They do not receive a bounce back email.

Running get-messagetrackinglog -sender "sender@problemdomain.com" reveals a list of messages with the EventID of "FAIL"

If I look at a specific message with running get-messagetrackinglog -sender "sender@problemdomain.com" -messagesubject "Test" | fl, I see that the RecipientStatus says

{250 2.6.0 Queued mail for deliver}

Note that this happens whether a real message is sent, or if I telnet locally on the Exchange computer using 127.0.0.1:25 and send a test message from that domain.

I have added the domain, and specific user to the BypassSenders/ByPassSenderDomains, but no avail.

We are running MS Security Essentials for AV, and once had SpamFighter Exchange module installed, but no longer.

Your help is much appreciated!

Rex
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