is there any possibility to set custom NDR-Messages?
Especially "554 The IP Address of the sender (%s) was found in a DNS blacklist database and was therefore refused." drives me crazy, because german senders never understand that they should get in contact with their provider and not with me in order to solve the problem

I´d like to provide a more simple, german message and a link to detailed informations regarding blacklists.
Thanks, cu Fabian