Mail.app extensions

Out of the box, the OS X mail client is pretty functional and useful; using the following extensions I’ve got it to cover all of my needs:

• Mail Tags 2.0:this is the best mail tagging system that I’ve ever seen, it even supports saving tags in message headers, a must for IMAP users.
• GPGMail:a featureful plugin for GPG/PGP users.
• Growl with mail.app notification:Growl is extremely useful on its own and together with the GrowlMail plugi-in provides a nice notification system for incoming messages.

Tikouka.net offers a comprehensive listing of mail.app plugins, check them out.