1.Log in to your CPanel Control Panel
2.Click the "Advanced DNS Zone Editor" Icon
3.
Select Your Domain From the Drop Down Menu
4.Adding DKIM record:-
5. fill the fields:-
name = l16._domainkey.domainname
TTL=14400
TXT data= v=DKIM1; r=postmaster; g=*; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDY9zqZ34BNVw7mMFjyzzm0LujS3jloqKFLXNlephxXsLvJW7JefckDKnTlgAXRZnv/wBs2Tsq6RHnq3E0CrfBzHJzg7d+39A1UuhvA0meNPGL0h0XIwSZD64WZ/m/eR22kPSeMV5YFSWqFB4+BRPUGoQqF7vvuzUFJTxEMSL2e4QIDAQAB