Just an informational note for any users of the GnuPG Mail plug-in. It does not work on Mountain Lion right now. The developers are working on it, but it will take some time due to the sandboxing of Apple Mail 6.0. If you use this plugin and need it, better hold off for a while.
Well I think the issue isn't the GPG plugin but the way Apple changes the way how Mail.app works without taking into consideration how many people rely on secure email communication and on this plugin.
Personally I think Apple should get in touch with the developers and bring it directly into Mail.app or, at least, give those guys advance informations in a way that they release an update of the plugin as soon Apple is a releasing a new version of it's email client software.
GnuPG Mail Plugin
