[MM3-users] Unprocessed Bounce Mails from user with e-mailadresse with a "-" in it

The recipient address abc-given.name@online.de (member of list mylist@myserver.de) has currently an out of office responder and mails are returning to my mailman3 system as unrecognized bounce messages.

I suspect the "-" in his address to be in conflict with the bounce address hyphen:

<mylist-bounces+abc-given.name=online.de@myserver.de>

Can any of you experts try on their systems, whether this a bug of mailman3 due to the "-" in the address?

Systeminfo:

Mailman Core-Version GNU Mailman 3.3.10 (Tom Sawyer) Mailman Core API-Version 3.1 Mailman Core Python-Version 3.11.2 (main, Apr 28 2025, 14:11:48) [GCC 12.2.0]