On Thursday, December 1, 2011, 12:09:42, Blake Hudson wrote: > I was under the impression that hosts using SMTP were required to have a > valid reverse DNS entry. The reject_unknown_reverse_client_hostname > restriction would then enforce this requirement. However, I can't find a > basis for this in RFC 821, 2821, or 5321. The closest I can find is > helo/ehlo requirements. Is there, in fact, any requirement for sending > hosts to have a valid rDNS entry?
RFC 1912 Common DNS Errors 2.1 Inconsistent, Missing, or Bad Data 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. -- r...@polylogics.com "The avalanche has already started, it is too Rod Dorman late for the pebbles to vote." - Ambassador Kosh
