This add-on for Mail.app is invaluable. Mail is supposed to have built-in support for encryption, but the help files are no help: it's unclear how encryption features can be activated. GPGMail comes to the rescue, with functionality at an even higher level than with its pre-Pather releases. I still have to find a way to save decrypted messages in their decrypted state, so indexing them will work, but that's a minor issue. And the arrow widget used to show and collapse signature information looks a bit like a placeholder for an actual widget, but that's the only gripe I have with this wonderful utility.