Step 1: Login to the cPanel account.
Step 2: Click on the default address option under Email section.
Step 3: Select the required option either from current settings by stating either discard email while your server processes it by SMTP time with an error message/forward to an email address.
Step 4: You can also set an advanced option like, forward to your system option or pipe to a program or discard from the list.
Step 5: Click on the change button to complete the process.