I looked into this a few months ago and went with cyrus. The author of courier claims the IMAP spec is non-sensical, so I didn't really feel like trusting his implementation of it--though many people report good experiences. The University of Washington has one too; I can't recall why I didn't go with it. I think the fact that other exim users reported good experiences was a factor.
cyrus has worked fine for me, though installation was a bit complex (the docs have since improved). But I have a very small system. If you do choose cyrus, be aware that your mail will be locked in a database and accessible only through the IMAP server. Other programs use a more generic format. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
