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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 here include:
OutgoingRunner: Use BounceMixin as a base class. We can now get rid of the
whole _permfailures and _permfail_counter stuff since we'll just use the mixin
class as the basic logic for bounce handling.
_dispose(): Simplified since we can just use _queue_bounces() when a message
is rejected at SMTP time, although if that triggers a probe, the attached
message will be the one for which delivery was attempted since there really
isn't any bounce. Also, make this method handle probe bounces.
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