What should I do? How to solve the problem?

Question

Mail server

I received a message that there are some problems with the mail server, a message with the following content: "unknown(ip address) non-existing revrse DNS PTR records."
How to solve the problem and who should I contact? Provider?

Answer 1

As a rule, to the provider. Well, or if the provider is thin, to the one who administers the reverse zone of the IP address. The error is that there is no PTR record (which defines the reverse translation of a name to an address) (although usually providers generate meaningless blah blah blah records).

Answer 2

Start with a provider.
You need to create a DNS A record in the reverse zone.
You need to look for someone who supports the reverse zone for a block of ip addresses, one of which was given to you.