On Sun, 19 Mar 2017, Peter wrote:
I would move your check_recipient_access to smtpd_data_restrictions, then it should work that it will not reject until the DATA command, but servers performing address verification will have bailed by that point. So you end up rejecting actual messages but not verification probes.
Thanks. Seems to work without negative side effects (till the communication to the next strange configured system happens :-).
The "keep in mind that this rejects mail for all recipients of the message" comment by Wietse is not an issue here, as there are no valid other addresses at the same server. Only admin and standard accounts. And I have no problem when they would get rejected if they are addressed together with the message to the no-answer mail-address.
Ciao -- http://www.dstoecker.eu/ (PGP key available)