--On 10. Mai 2017 um 16:36:54 +0900 "Stephen J. Turnbull" <[email protected]> wrote:

BTW, the practice of sending spam to -owner addresses has a long
history.  I suspect this is not a matter of exploiting a Mailman bug
unknown to us, but just luck on the part of the spammers.

FWIW, the messages we saw were *not* sent to the -owner address, but to the list address using one of the admin addresses for the list in the From:-header. On the MTA level the envelope-from was always [email protected].

Cheers
Sebastian
--
   .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
                .:.Regionales Rechenzentrum (RRZK).:.
  .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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