Hello,
I am having some problems with a host hammering my logs all day long because the connection is rejected with 450, even after I have spoken with the person responsible for the domain, explaining why this is happening and what he should do to fix it. hostname ip92.llpdynamics.com does not resolve to address 5.35.210.92: Temporary failure in name resolution NOQUEUE: reject: RCPT from unknown[5.35.210.92]: 450 4.7.1 Client host rejected: cannot find your hostname # host ip92.llpdynamics.com ;; connection timed out; no servers could be reached I know that Postifx manual (http://www.postfix.org/postconf.5.html) states that: "The unknown_client_reject_code parameter specifies the response code for rejected requests (default: 450). The reply is always 450 in case the address->name or name->address lookup failed due to a temporary problem." But is there a way to change this behaviour to 550/554? This situation is not exactly temporary and it is happening for over a month. I could just forget about it, but this server's retry is very very low. unknown_client_reject_code = 554 does not seem to apply to temporary failures in DNS Thank you. Razvan Constantin
