[MERGE] Add mail-mode GNU Emacs mail package as a mail_client option.

[Vincent Ladeuil]

>>>>> "aaron" == Aaron Bentley <aaron at aaronbentley.com> writes:

    aaron> Xavier Maillard wrote:
    >> It should address all your comments (I guess).

    aaron> Yes, it does.  Thanks.

    aaron> bb:approve

    aaron> Though I still have doubts about whether we should be
    aaron> supporting two different ways of sending mail via
    aaron> emacs...

Look at it that way:

We should support several different ways of sending mail from
Ubuntu because there exists several available MUAs.

Now replace Ubuntu by emacs.

And I'm serious :)

    Vincent

P.S.: Not adding bb:comment since bb still doesn't love Gnus :)