I don’t see python on your image :)

I finally manage to encrypt the body trough ptyhon-gnupg ( warning their documentation is still in alpha stage. )

now, remain to encrypt the subject (ThunderBird compatible) if you have any clues I’m all ears

When time permit I will publish my code in a pastbin.

Wubba Lubba dub-dub**

indeed, but a lot of Linux distribution come with it :)
otherwise it’s installable.

instead of using a library I can directly use subprocess with gnupg but in both case it seem gnupg require to import the public key to the keyring !? I don’t want that.