Mail.app on OS X and GPG keys
This page describes how to use Mail.app together with GPGMail.- you need to install macgpg for your mac it can be found here
- you need to create your keys
- here's a simple GUI front end to macgpg Gpg Tools
- get the GPGMail plugin for Mail.app and follow their install instructions.
- if the above went smoothly you now have GPG functionality and for OS X users that like the board game go check this out