Hi,
Today, we realized the bounce processing of mailman3 was broken and once we
brought it back up, it started processing a huge queue of bounced mails.
You are very likely going to receive lots of emails related to bounce
processing (if you have it enabled, for example notification of
unsubscription due to excessive bounce)
We are sorry for the inconvenience. Check
https://phabricator.wikimedia.org/T282348 for more information.
Best
--
Amir (he/him)