If you have a minute, I am a little confused about addressing rDNS warning for outbound emails. I have this setup...
http web server (ip 1.2.3.4, hostname apps.acme.com)
smtp mail server (ip 1.2.3.5, hostname mail.acme.com)
DNS A record (Domain name = acme.com, ip = 1.2.3.4) --> web server
PTR record (Domain name = acme.com, ip = 1.2.3.5) --> smtp server
The smtp server only sends mail, no inbounds, no MX record, etc.
However, when I check mail reputation score, I see rDNS warning and found that PTR records should have corresponding A record (forward-confirmed). However, if I create a second DNS A record for the smtp server...
DNS A record (Domain name = acme.com, ip = 1.2.3.5) --> smtp server
Won't this mean that the authoritative server will direct some acme.com DNS resolution traffic to the smtp server? thank you very much for reading this.