You can use transport: specific the server IP for different users.
2013/7/18 Wietse Venema <wie...@porcupine.org> > Bill Stephens: > > How do I configure postfix as an inbound gateway and have it forward all > > user email to an exchange server, except for a few selected users. For > > those users, re-route their traffic to a different server? We have a > > couple of accounts that receive a lot very large attachments and it's > > bogging down our exchange servers for normal users. > > Look for the first search engine hits with "postfix exchange". > > Wietse >