WHM/CPanel Client host rejected: cannot find your hostname

:

Mail Delivery Fail
cannot find your hostname PTR
.local

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PTR IP ip

You do not have a PTR for that IP, which means the IP does not match the hostname off the server in the IP DNS zone. The IP provider would be the one to correct that issue, since they control the IP zone that would need your PTR set to the hostname for the IP.

:

https://support.cpanel.net/hc/en-us/...your-hostname-
https://forums.cpanel.net/threads/45...stname.134861/
https://serverfault.com/questions/97...cted-cannot-fi
https://talk.plesk.com/threads/450-4...stname.343308/