It is a feature that allows you to collect all emails sent to an invalid email address on the domain Step 1
1 - Logged into your cPanel, select "Default Address" in the Email section.
2 - Arriving on this screen you must choose the domain that will carry out the configuration.
Now, you must decide what the system will do with messages for non-existent senders from that domain.
1. "Discard the email while the server processes it at SMTP time with an error message", an error message is sent to the sender;
2. "Forward to email address", the message can be directed to an email account of your choice;
Step 2
3. It is still possible, in "Advanced Options", to choose three other alternatives:
4. Finally, save your settings by clicking "Change".
Hope this helps !