I have an Exchange 2000 server, where users have several smtp email aliases - e.g. mail to both rvanhout@ and roel@ end up in my mailbox. This is easy, through the Exchange Users & Groups interface. 'rvanhout' is my Active Directory domain username, 'roel' is the alias (one of the aliases) I have set up.

However when I *send* mail, the From: header always shows rvanhout@, i.e. the Active Directory domain username. Even when I send mail from my local machine with roel@ in the From: header, Exchange changes it to rvanhout@ when processing it. There are circumstance in which I really want to send mail with roel@ in the From: header, e.g. when unsubscribing from mailing lists that use this email address.

Obviously I could use kludges like using another smtp server for these messages, but I'm annoyed that Exchange is rewriting my headers. On the other hand I guess it can be blamed on my lack of knowledge about Exchange. So, is there a way to change this behavior?