[PATCH v2] test: attempt to send QUIT to smtp-dummy in case mail send failed

[Austin Clements]

LGTM.

Quoth Tomi Ollila on Nov 16 at 11:25 pm:
> If mail sending from emacs fails before it has chance to connect
> to the smtp-dummy mail server, the opportunistic QUIT message
> sending makes smtp-dummy to exit.