A catch-all email mailbox receives email messages sent to inactive addresses under the exact same domain name. For example, a message sent to the misspelled suport@domain.com will go to support@domain.com if the catch-all feature has been activated for the latter. Thus, you can get emails from friends or clients who may have sent a message to your email address with a typographical error or to an outdated one, which they may still have, but you have already deactivated. Only one mailbox per domain can be a catch-all one and email forwarding cannot be set up for such a mailbox. The latter is due to the fact that at some point you may begin receiving spam email messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be delivered to a 3rd-party mailbox.