I would like to set up Exchange so that when a user (e.g. user@mydomain.com) sends an email to somedomain.com Exchange makes the email appear to have come from other_user@mydomain.com.

This would have to be done on a per-domain basis, and invisibly to the user. So all emails come from user@mydomain.com, except emails to somedomain.com, which appear to come from other_user@mydomain.com.

If anyone has any ideas I would really appreciate it.




In Exchange 2003 you're going to have to implement a transport event sink (see http://technet.microsoft.com/en-us/library/bb123644(EXCHG.65).aspx for details) to do what you're looking for. There isn't any built-in functionality to do this, but such an event sink wouldn't be that hard to develop.

(If you have plans for Exchange 2007 or 2010 be aware that transport event sinks are no longer supported in those releases, too.)

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