Configuring an IMAP Server with IMAP-UW
The Internet Message Access Protocol (IMAP) is an alternative to POP that many users prefer; in fact, in the modern era of centralized email services such as Gmail and .Mac that encourage users to archive their mail for premium-grade indexing on the server rather than deleting it all as it’s read, IMAP is displacing POP as the mail-reading protocol of choice. You will probably want to support it on your mail server, along with POP and SMTP services, to make your server offerings complete.
The fundamental difference between IMAP and POP is that whereas POP downloads each message from the server and stores it in the mail program’s internal database, IMAP mail is accessed and manipulated wholly on the server. ...
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