New - As of Enigmail version 0.74.0 for Mozilla 1.3 and 1.3b, the Enigmail releases for Mac OS X are provided on the normal download page.
A test version of Enigmail is available for Mac OS X. To try it out, you need to download and install a custom Mach-O build of Mozilla available from the following URL:
http://www.KeXT.net/enigmail/Mozilla-Macho-1.2b.app.tar.bz2
Note: The above build is different from the default CFM build of Mozilla available from mozilla.org. It may not share the same preferences and configuration information as the default build.