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

[Xavier Maillard]

   > I can't find a register link
   > there.

   No, registrations are done manually because it's a rare event.  Accounts
   give you the ability to approve other people's work for merging, so
   they're given out sparingly.

Ahem, yes I would not comment on other's code :) I am not skilled
in python anyway.

	Xavier
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