Sunday, March 27, 2011

Exchange - Multiple copies in forwarded mail

Q: If you forward all your mails (Exchange) to an external email account using ADUC you receive multiple copies only if you also keep a copy in your exchange mailbox. If you do not keep a copy then this issue does not occur.

A: After jostling with this issue for 3 day myself, logged a case with MS.

After 14 hrs of continuous troubleshooting on this SEV 1 case and 4 MS engineers putting all their exchange skills together, we were able to reach to a solution.
A pretty stupid indeed.

Go to virtual SMTP server properties in ESM -> Access -> Authentication.
Check all the authentication methods.

Bingo and the issue is resolved. It happens because of the way Exchange servers authecticate each other. The first incoming hop in my exchnage organisation receives a mail and should split the message and send two copies. One to forwarded address and one to my Exchange mailbox. This splitting does not work if only Anonymous authentication is selected on the SMTP virtual server of the HomeMDB server of the user.


 


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