There are four mailing-lists about RT that you might be interested in:

• rt-announce@lists.bestpractical.com - announcements of new RT releases and security issues. Very low traffic.
• rt-users@lists.bestpractical.com - general discussion of the use of RT, basic troubleshooting, sharing of tips, etc.
• rt-devel@lists.bestpractical.com - discussion of modifying RT's codebase yourself or deep technical discussions about RT
• rt-commit@lists.bestpractical.com - Commit notifications via email

To join any of these lists, send mail to [=(listname)-request@lists.bestpractical.com] with a message body consisting solely of the word: subscribe

Searchable archives for all of these lists may be found at http://gossamer-threads.com/lists/rt/ or http://archives.free.net.ph/splash/index.en.html; a more complete list of mailing list archives is on the MailingListArchives page.