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

[Aaron Bentley]

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

Yes, it does.  Thanks.

bb:approve

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

> By the way, could you tell me if this patch is really
> MIME-attached ?

Yes, it looks good to me.

Aaron
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