[Buildbot-commits] [Buildbot] #2217: Allow MailNotifier's messageFormatter to be asynchronous

[Buildbot]

#2217: Allow MailNotifier's messageFormatter to be asynchronous
------------------------+-------------------
Reporter:  tom.prince   |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  minor        |  Milestone:  0.8.+
 Version:  master       |   Keywords:  mail
------------------------+-------------------
 [This](https://github.com/tomprince/commit/buildMessage-deferred) has code
 that does this, but it could use some tests to verify that it actually
 works asynchronously, and documentation.

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Ticket URL: <http://trac.buildbot.net/ticket/2217>
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