Reverse MX A records (PTR)

Can you please explain what is this reverse mx.
https://intodns.com/ulmaari.com
ERROR: No reverse DNS (PTR) entries. The problem MX records are:
112.172.167.108.in-addr.arpa -> no reverse (PTR) detected
You should contact your ISP and ask him to add a PTR record for your ips

That IP address isn’t assigned a hostname. As the error message indicates, you can’t fix that at Cloudflare. This needs to be set by the owner of that server.

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