Hello,
just a speculation, but there was a very similar incident recently
on a completely unrelated mailing list (few weeks ago) hosted by
googlegroups, there could be a spam-wave targeting this platform.
The mentioned mailing list eventually moved to groups.io since its
owner lost his access to the administration of the group, plus
googlegroups has been doing other weird things in the recent
years, I can't join any gg mailing list with my primary eMail
address hosted by Protonmail, our mailing list also started
refusing eMails containing any links, even if they were legitimate
traffic.
So, changing the server is something I wouldn't object to.
Groups.io is quite developed in this regard, but there are other
options, too.
Best regards
Rastislav
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