The PTR record as an opposite of the A record.
PTR records are used for the reverse DNS (Domain Name System) lookup.
Using the IP address you can get the associated domain/hostname.
An A record should exist for every PTR record.
The usage of a reverse DNS setup for a mail server is a good solution.
Some external mail exchange servers make reverse DNS lookups before accepting messages originating from your mail server.
- 『Manage Reverse DNS』
Enter Domain name >『Add』
The reverse DNS setup process will take about 24 hours.
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