Mailtron Gateway is a POP (and for Mac OS X, a POP/IMAP) email gateway from Studiotron Software that allows multiple people at a single domain to share a single email account. The license key that is required after the initial 30-day usage period is free for "Classic" Mac OS. Version 3.x (for Mac OS X only), however, comes as a fully-functional demo that runs for 30 days (except that he fetchmail daemon will not automatically run after a system restart) and can be registered for $69. The Mac OS X version features "industrial strength" mail forwarding using fetchmail, and automatic protocol detection, including IMAP.
Version 3.0 - the latest release for Mac OS X - adds/addresses the following:
"This fine, free program works as advertised. It is easy to set up and runs like a champ. We use it to route all the Internet email for our entire company (15 users)."
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Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
Graham Orndorff has written a superb collection of articles on setting up email servers and secure email clients on Mac OS X.
Adam Engst has put together a comprehensive overview of email attachment formats that is invaluable for anyone who wants or needs to understand the complexities behind them.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!