I see following maillog records when new mail comes to server
connect from unknown [126.96.36.199] client=unknown[188.8.131.52]
resolv.conf content for Postfix listed below
# Generated by NetworkManager nameserver 184.108.40.206 nameserver 220.127.116.11 nameserver [hosting_dns_servers_here] # NOTE: the libc resolver may not support more than 3 nameservers. # The nameservers listed below may not be recognized. nameserver 18.104.22.168 nameserver 22.214.171.124 nameserver 126.96.36.199 nameserver 188.8.131.52
So, how can I force Postfix to make reverse lookup and logs a domain name of mailserver not IP address? I'm running CentOS 7.4
And at the second where I can read about postfix reverse lookup process?
May be you would point me to some place in the postfix sources, I don't know, indeed...
I guess it's some kind of internal issue of my VDS provider. Caused by the internal network architecture of dedicated server hoster. Anyway, I want to read postfix source code which related to reverse DNS lookup procedures and try to understand, why it doesn't work as expected in my case.