> > It's a catchall forwarded domain "@olddomain -> @newdomain", so > Postfix accepted it before checking the final recipient. > > Now that you said it, I'm going to suggest to the user to just > alias individual addresses instead of the catchall. > > I still think Microsoft should not complain about NDRs, especially > if the original was from them.
Your approach is generating backscatter spam (to hotmail, where the mail may not even have originated - the "From:" address is likely forged so your assumption that it originated from hotmail could well be wrong), which (being polite) is not considered a good thing. You need to reject the mail on the originating connection, rather than bouncing after acceptance. [you could consider tossing non-deliverable messages rather than bouncing them, but you could end up junking "legit" non-deliverables.] Backscatter spam *will* get you on blocklists. _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
