Nick Edwards put forth on 11/9/2010 4:33 AM: > "Make sure your PTR and A records match. For every IP address, there should > be a matching PTR record in the in-addr.arpa domain. If a host is > multi-homed, (more than one IP address) make sure that all IP addresses have > a corresponding PTR record (not just the first one)." > > Apparently, I'm led to believe that postfix in doing lookups only takes the > first answer it gets, therefore if DNS returns 2 or more, and the first > entry for whatever reason has no record then pf fails the lookup under > unknown client hostname.
Note that RFC 1912 text refers to a multi-homed computer, NOT a computer with one IP address with multiple PTR records. You are drawing a false conclusion WRT Postfix' behavior regarding RFC 1912. In the RFC 1912 scenario above, Postfix behaves correctly. The case you are describing, multiple PTRs per IP address, is not covered in RFC, TTBOMK. There is no requirement nor recommendation for the multiple PTR record scenario. -- Stan
