In this screen you can add a forwarding rule. Press 'Save' to save the forwarding rule.
Specify a e-mail address the mail will be forwarded from: type a user name before @ in the 'E-mail' field, and select one of your domains. If some of your users has mailboxes in several of our domains (like username@yourdomain1.com, username@yourdomain2.com, etc.), select (multiple domains) to forward all mail sent to all mailboxes registered for this user.
Catch-all e-mail is a kind of mail forwarding. But in this case, you forward absolutely all e-mail that comes to one of your domains or to any of your domains, except e-mail addressed to the existing addresses in your domains.