Hi Blake! Am 2011-12-01 18:09, schrieb Blake Hudson: > 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? To my best knowledge, no. It's just common practice.
cheers, Michael
