Updated: 28 September 2026 · Applies to: cPanel & WHM 138 (Jupiter theme)
You can reject mail for addresses that do not exist on your domain with an error message of your own, so senders know their message was not delivered.
Steps
- Log in to cPanel (for example at
https://yourdomain.com:2083, or from the Ucartz client area). - Open Email › Default Address and choose the domain.
- Select Discard the email while your server processes it by SMTP time with an error message.
- Enter the message, for example
No such address here. Please check the spelling or write to info@example.com. - Click Change.
The message is rejected during delivery, so the sender's own mail server returns your text to them. Your server does not send a separate bounce email, which protects your IP reputation.
