1. Log in to cpanel.
  2. Create a TXT record with the following values.

                      Name/Host/Alias       :        _dmarc

                      Time to Live (TTL*)   :         3600

                       Record Type             :         TXT

                      Value                          :          v=DMARC1; p=quarantine; pct=5; rua=mailto:postmaster@your_domain.com

NOTE: To allow third-party recipients to monitor, quarantine, or reject all the messages that claim to be from "your_domain.com" and fail the DMARC checks. You must replace "your_domain.com" with your own domain name. Daily aggregate reports will be sent to "postmaster@your_domain.com" (You'll need to specify a valid email address to receive reports for your domain).