On Sat, Oct 10, 2020 at 10:53:08AM +0200, c.buhtz@posteo.jp wrote: > On 2020-10-10 15:03 Maxim Nikulin wrote: > > 1. Use "duplicate" sieve extension. > > [..] > > > > 2. Just add filter > > [..] > > This are workarounds but not solutions. > > IMO the problem is the list user that "Answers to all". "The problem are always the others". Way to go! Did you read the reference I sent in reply to you? Did you take into account that this list is open to non-subscribers? > Why should I modify my system because another one make errors? It's not "errors". It's the way an open mailing list works. Entering a room and yelling "Hey, all of you stop doing things the way you're doing it. I'm gonna tell ya how you gotta do things now" is, to put it politely, slightly unpolite :-) Cheers - t