The Catch-all mail box receives all messages which would be otherwise rejected because the receiver does not exist.
In order to create catch-all email address in cPanel please do the following:
Step 1. Log in your cPanel account.
Step 2. Find “Default Address” option in “Mail” menu.
Step 2. On the new page choose domain name from drop-down menu, check option “Forward to email address” and enter email address to which emails will be forwarded.
Step 3. Click on “Change”
Done!!