Bitmessages are not email, but they do something like the same thing, you need a special application program to use it, but there is no sign-up or registration, once you have the app installed you're good to go.
The app is currently available for Windows, OSX, and Linux, but as yet nothing for Android and i-whatever.
You can bitmessage to me at this address:
BM-2DBjcihFsQoWieWz49ZCzhfczDQmRadkem
Memorable isn't it? :-)