> > > I think it would be easier to just accept only emails for > your domain(s) at > > your mta (postfix or exim), then enable the antispam filter on > > exchange and configure it drop (not reject / bounce) any > messages to invalid addresses. > > That's a very bad idea-- legitimate senders will sometimes > mistype addresses, and having their messages disappear into a > black hole with no notice to the sender is... suboptimal. > >
The last server to give a 250 SMTP Code is responsible for for sending the bounce message. If they send the message to your server and your server gives a 550 SMTP code then it's still the users own server who is responible for sending the bounce message. The only other way to do it is if you manually sort through emails who's "to" address is mistyped. I personally rather not do that. Kaleb
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