Hi everyone,
In Mailman2 some lists would ban everyone and then manually add
subscribers who should be on the list. In Mailman3 this is no longer
possible, the ban list trumps everything. If an address is banned,
messages from it will be silently discarded, regardless of whether
they're subscribed or any other options.
We have so far either removed these kinds of bans during imports or held
off importing these lists yet.
Please review your list's ban list ("Ban List" tab in Postorius) and
remove any overly broad ones.
As a sidenote, we now have the ability to enact global bans, so if
there's a domain or pattern spamming across multiple lists, we can block
it in one spot.
I've also added this information to
<https://meta.wikimedia.org/wiki/Mailing_lists/Mailman3_migration#Review_bans>.
-- Kunal