desperate... Help needed

[DRabbit]

I'm working on getting IMAP going on my mac pro and on my iPhone... Its really giving me a headache after too many hours of trying different things.

I can receive mail fine but I cannot send mail. I keep getting "connection failed" type messages. I'm using port 587 (its how the server is set up), and authentication (password). No SSL. I'm sure everything is entered right. I got it to work lickety split with outlook express but I just can't seem to get it to work in mail.app -- either on the iPhone or Mac pro.

I've tried deleting the account and setting them up again. I've tried deleting the outgoing server in server list (on mac pro). I've tried with SSL and without (just to be sure). HELP! LOL

Ideas? I need a true mac genius...

(and yes, i know about using my isp's outgoing server on my home pc, or at&t's on the iphone, but i have my own server and domain and really would like to sent from my own mail server)