How can I prevent exim from rewriting addresses that do not go out over a smarthost? Specifically: If I send a mail from one LAN machine to another (using my debian/exim host as relay) the mail is delivered locally but the "from" field is rewritten to the external address of the user. So if I hit reply on the target machine the mail will go over the smarthost, even though its target is practically local. (Am I making enough sense?) Christian