Hi,
The bounce processor in Mailman3 is much much better, in the past week
we've unsubscribed thousands of emails that have been bouncing for years.
However, the bounce processor crashes sometimes, so it builds up a queue
so you may receive floods of emails about users being unsubscribed.
We're working with the Mailman3 developers on this, it should be fixed
soon (I hope). <https://phabricator.wikimedia.org/T282348> tracks this.
Some lists also had really low bounce score thresholds, that likely
would have caused legitimate subscribers to be kicked off (the logs show
this only happened for the listadmins@ list, the irony). I went through
and increased the threshold on all lists (see [1] for affected lists) to
at least 5. If your list doesn't get enough activity to ever hit that
threshold, please increase the time the bounce info is valid for
("bounce info stale after") rather than reducing the threshold. I've
also documented this at [2].
[1] https://phabricator.wikimedia.org/T282501
[2]
https://meta.wikimedia.org/wiki/Mailing_lists/Administration#Bounce_processing
-- Kunal
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