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queuing of bounce events out of the process's memory and into a 'bounce event'
file, essentially consisting of a stream of pickles. Every once in a while
the qrunner wakes up and processes the event file, which is named to be
specific to each qrunner instance. The actually processing is factored out
into a mixin class which is now subclassed by both the BounceRunner and
OutgoingRunner classes (since the latter has to handle SMTP rejects as
bounces).
Specific changes include:
REGISTER_BOUNCES_EVERY: Promote to a Defaults.py.in variable.
BounceMixin: Mixin class for handling the basics of bounce event queuing,
periodic processing, and registering, as well as cleanup. It also contains a
_probe_bounce() method for handling bounces of the probe message (which cause
an immediate disable).
BounceRunner: Add BounceMixin as a base class.
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