your a record and fqdn, your helo/ehlo hostname and the ptr record all need to match.
Sent from my iPhone > On Mar 9, 2021, at 12:36 PM, Greg Sims <webmas...@raystedman.org> wrote: > > > We are receiving the following in our email logs: > > Mar 09 08:12:15 mail01.raystedman.org postfix/smtpd[13431]: warning: hostname > mail01.raystedman.org does not resolve to address 192.168.122.12 > > This warning is in fact true. I believe something is not configured correctly. > > The postfix mail server at mail01.raystedman.org has two network interfaces: > WAN and LAN. The WAN hostname is mail01.raystedman.org which resolves to > 166.88.17.149. The LAN hostname is mail01-p.raystedman.org which resolves to > 192.168.122.12. > > main.cf contains: > > mynetworks = 192.168.122.0/24, aaa.bbb.ccc.ddd/32, 127.0.0.0/8 > > where aaa.bbb.ccc.ddd/32 is the only acceptable WAN address (protected here > and at the firewall level). We also accept email from the LAN and localhost > networks. > > We recently started accepting email from the single WAN address and added the > IP to mynetworks. This likely has something to do with the configuration > issue. > > Thanks, Greg > www.RayStedman.org
