I think I am using postfix defaults here. WHen a client is rejected because of a mssing reverse hostname, I see:
Nov 21 15:37:02 mail smtp/smtpd[2168]: NOQUEUE: reject: RCPT from unknown[46.221.40.2]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [46.221.40.2]; from=<a95901...@rna.nl> to=<a95901...@rna.nl> proto=ESMTP helo=<[46.221.40.2]> And I was just wondering: why is that a 4xx message (temp failure) and not a 5xx failure? G
