On Mon, Dec 26, 2011 at 12:33 AM, Wietse Venema <wie...@porcupine.org>wrote:
> Sahil Tandon: > > 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. > > Confirmed. According to my copy of /usr/include/netdb.h: > > #define TRY_AGAIN 2 /* Non-Authoritative Host not found, or > SERVERFAIL */ > > Postfix uses the main.cf reject codes only in case of non-error. > > Wietse > Thanks, I got a private reply saying exactly that :-) > NXDOMAIN will 5xx, but SERVFAIL will 4xx
