Trying to setup exchange and smtp for users who will connect via outlook or mac mail to the exchange server with imap. I can get the users logged in to recieve mail and sync folders but sending via smtp fails. If I use no authentication the user can send mail to internal addresses but external addresses come back with no relay allowed. If I try to setup outgoing mail server authentication on the clients they do not connect to the outgoing mail server, it keeps saying incorrect username or password. I have tried every variation of domain\username, username, and username@domain I can think of.
This is a new installation of exchange 2003 on a SBS.