Email Send Failed

While sending email, the mail server is giving me this error:

Diagnostic-Code: smtp; 554 IP name lookup failed. No PTR record found.

Is there any setting in whm or cpanel which can be changed to solve this problem.
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Jason CrawfordTransport NinjaCommented:
If you're the one sending the email you need to add a PTR record for your mail server.  A PTR is like a reverse of an SPF and maps an IP back to a FQDN.  Gather the outbound WAN IP of your email server and the FQDN (ie and open a ticket with your ISP to create the record.  You can't create it in your DNS zone file because it's tied to the WAN IP owned by the ISP, not the domain you own.

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