oh, sorry, I wanted to send my question to german mailing list. Thomas Am 23.05.20 um 14:17 schrieb Claus Assmann:
Please use an address for which you can receive at least non delivery status information. Otherwise, why do you expect the recipient to handle your non-replyable address in any other way than you do, e.g., also rejecting it with an error? And if you really don't care: just alias the address to /dev/null.