My FC13 installation works fine. I use SquirrelMail no problem, and have also used emacs's Rmail for sending and getting mail. I'd like to be able to use my iPhone use my server for sending and retrieving mail, but I guess I just don't understand what's required. For example, I add a new account on my iphone for an imap account and add the host name under incoming and outgoing mail server, but the account verification just times out. I can't send or receive mail. Clearly there's more to it than I understand. Is there a setup guide somewhere or can someone advise how to set this up?

How is your iphone connecting? Is it via your wireless LAN or via mobile internet? If it's via the internet does your server name resolve correctly? Also, do you have different access rules for different parts of your network?