fxmaker: Forgive me for being dense, but I could not find out how to make a user specific to a single domain so that U@Domain1 and U@Domain2 are different users.
Create the local maildrops as UserA, UserB, UserC
Then add aliases, so that f.ex.
info@domain1.com == UserA
info@domain2.com == UserB
this is how we run lots of domains and aliases. People who f.ex. retire, but keep their domain, have asked us to change their addresses from john@domain.com to f.ex. john.a@domain.com and they only get emails from people they really want to get email from, without having to alter usernames or passwords.
Kind regards / Peter