To update a catchall for a domain name that is associated with your server, follow the steps below:
Click the "Catchall" Addresses link from within the Mail Management menu.
A list of currently defined catchalls appears, if any.
Click the Edit link next to the catchall you wish to edit.
Enter the new destination and click Update.
Click the Restart Sendmail link to activate the changes to your catchall settings.
Any email improperly addressed to the domain name of the catchall will now be delivered to the new catchall destination.