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. However, I recently tested a connection (using telnet on the client side, connecting to port 25) from a server that does have rDNS in place, but I still get the "connect from unknown". I did "dig -x 1.2.3.4" on the server for the same IP address and the result came back with the correct domain name. So why didn't postfix see the host name? I restarted postfix in case it was caching, but it didn't help. I also tried putting this in /etc/hosts 1.2.3.4 host.example.com That didn't help, either. Appreciate any tips.
