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.
Cheers,
RB.