On Thu, 2022-01-13 at 15:20 +0100, Markus Grunwald wrote: > > I'm a bit at the end of my wits. All I want is that people can > send a mail to distribut...@myserver.de and some 20 other people > with various addresses will get that mail reliably. Being able to > respond is a bonus, but not really necessary. >
The hardest problems often have the simplest statements. An alias will never work due to SPF. A mailing list can, but you have to be careful with DKIM/DMARC. Those signatures protect the "From" address and the body of the message, so when the sender has a policy that insists the signature be valid, you either (a) can't touch them, or (b) can't retain the original sender/signature. In short, you have to choose a mailing list package that is aware of the issues and can work around them, like the 3.x series of GNU Mailman. And then you have to configure it very carefully.
