I want to make sure I set up reverse DNS correctly for my domain/ip and DNS.
Since it is not correct now, I get warning messages and ultimately I am afraid that my server may be recjected or blackballed from email providers that perform reverse DNS lookups.
When I open an ssh session, I get:
reverse mapping checking getaddrinfo for 220.127.116.11-unallocated.colocationamerica.com [18.104.22.168] failed - POSSIBLE BREAK-IN ATTEMPT!
I am in control of my own DNS zones and records for my domains.