Quoting observerofaffairs@??? (observerofaffairs@???):

> To: linux-kernel@???
> Cc: dng@???, debian-user@???

Dear listadmins (and assembled):

I've found as a Mailman listadmin that subscriber misbehaviour like the
above can be curbed by going into Mailman webUI pages, Privacy options,
Spam filter, and adding new header filter rules like this:

Spam Filter Rule 1
Spam Filter Regexp: ^(To:|Cc:).*linux-kernel@.*\.kernel\.org
Action: Reject


Spam Filter Rule 2
Spam Filter Regexp: ^(To:|Cc:).*debian-.*@lists\.debian\.org
Action: Reject


Making these specific two crosspost regexess not work fails to prevent
_other_ crossposts fail (sadly), but on the bright side prevents the
same miscreant from succeeding merely by using a different throwaway
webmail account.


(Torvalds would call this 'management by perkele'.
https://en.wikipedia.org/wiki/Talk%3AManagement_by_perkele
https://en.wikipedia.org/wiki/Finnish_profanity#perkele )

-- 
Cheers,                        "When closing parentheses, it's polite to post 
Rick Moen                      a sign saying when they will reopen."
rick@???                                     -- @FakeAPStylebook
McQ!  (4x80)