From Rich Siegel, primary author of the fabulous BBEdit text editor, comes the Mailsmith email client, which offers very sophisticated email filtering (including integrated support for SpamSieve and PGP), a clean user interface, and a BBEdit-like editing capability that few other email programs can match.
Version 2.2 made a positively huge number of enhancements that belies a bump in version number from 2.1 to 2.2, but the main shift was from a commercial to a freeware application. Bare Bones software's Rich Siegel noted:
"As this release, Mailsmith is no longer a product of Bare Bones Software. It's now being maintained, developed, and supported under the auspices of Stickshift Software, LLC, a company which was formed the the specific purpose of giving Mailsmith a home. My ongoing goal is to support and enhance Mailsmith on an ad-hoc basis as has been done over most of the 2.2 beta cycle: this means occasional (if not exactly regular :-)) releases to fix bugs and add features. (My work at Bare Bones Software remains my first and highest priority.) The other big change is that Mailsmith is now freeware. The price tag has been removed, and it is available for use at no charge. The end-user license agreement has been modified to reflect this, and is likewise available for review on the web site."
Version 2.2.5 makes the following additional changes:
Mailsmith requires Mac OS X 10.4 or later; Mac OS X 10.5 or later is strongly recommended.
Currently, no user reviews have been submitted. Send me yours!
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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!