[exim] GPG support inside Exim's config

Hi all,

regarding the lastes news about PRISM, i had an idea and maybe someone
has done that already:

A transport could autosign and autoencrypt messages with pgp/gpg.

If it's done via mta the client doesn't need to support it, which means,
it will even work with any webmail.

Does anyone have a gpg transport working ?

Marius