On Sat, 2011-12-24 at 23:09:24 -0500, Sahil Tandon wrote: > On Sun, 2011-12-25 at 13:37:52 +1000, Nick Edwards wrote: > > In the absence of full information, here's a WAG: > > > ... > > : NOQUEUE: reject: RCPT from unknown[41.203.141.1]: 450 4.7.1 Client host > > rejected: cannot find your hostname, > > % host 41.203.141.1 > Host 1.141.203.41.in-addr.arpa not found: 2(SERVFAIL) > ^^^^^^^^ > This is treated as a temporary error condition, so Postfix applies > reject_tempfail_action, which defaults to defer_if_permit. > ...
Also, from postconf(5): 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. -- Sahil Tandon
