A catch-all mailbox receives messages sent to non-existent email addresses under the very same domain. For instance, an email message sent to the misspelled suport@domain.com will be delivered to support@domain.com in case the catch-all feature has been enabled for the latter. In this way, you can receive emails from pals or clients who may have sent a message to your email address with a spelling mistake or to an outdated one, which they may still have, but you have already disabled. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be activated for such a mailbox. This is so because of the fact that at a certain point you may begin receiving spam messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be redirected to a third-party mailbox.