E.B. wrote: > Hello, > > My understanding was clients for whom you see this in the logs: > > connect from unknown[1.2.3.4] > > Do not have a PTR/rDNS set up for themselves.
For Postfix to include the rDNS in the log and Received: header, the PTR name must then resolve back to that same IP as well. Sometimes there will be a PTR record, but no matching A record. Also keep in mind that if there is a temporary glitch in DNS resolution, either the PTR or A lookup might fail when the message first passes through, but looks fine later on when you check by hand. -kgd
