When an email bounces back, the sender receives an NDR (non-delivery report), which includes the reason for the bounce back.
Typically, the bounce back reason provides a very clear explanation as to the cause of the bounce back.
See cPanel -> Email section -> Track Delivery for more information.
If you have a question about a specific bounce back email, then make sure to include the full text of the bounce back email into the support ticket, so we can review the information on your behalf.
Please let us know if you have any questions or need further help.
