We recommend our users to enable SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) records for your domain. SPF allows a domain owner to add a file or record on the server that the recipient server cross-checks and DKIM embed information within the email, making it harder to forge. We have provided steps to enable on cPanel.
Login to cPanel > Email and click on Authentication menu
Next, click on Enable for DKIM and SFP
And Done, refresh the page after some time.