I managed to get Postfix setup and working. Pop3 access works great so I tried to see if IMAP is working. I'm using Windows Live Mail as my external client and I can send and receive emails fine. What I can't figure out how to do is create the standard Junk, Trash and Sent folders and get them to work appropriately. I only have an Inbox folder.
Postfix is a mail transfer agent (MTA), generally speaking it handles SMTP connections and has nothing to do with POP3 and IMAP connections. You must be also running some mail server like courier or dovecot for POP3 and IMAP support.
If you still need help on this, the solution I found is mentioned on the last reply on my thread: http://forum.linode.com/viewtopic.php?t=7273 I think that is what you will be looking for.
