Wietse,
Maybe I should re-phrase my question. On my Exchange server, if I e-mail an
invalid address, it will e-mail be back and tell me that the recipient does
not exist. When I e-mail an invalid address using a web/imap/pop hosting
provider, I get an e-mail telling me the recipient is not valid. I'm under
the assumption that my Postfix server is not allowing a bounce to come back,
but I do not know if it's a configuration issue or if it's just the way
things work. I've been told by someone knowledgeable with e-mail servers
that it should be possible to get a reply back saying the recipient is
invalid so I'm thinking it's a configuration issue. Are you telling me it's
just not possible?
