A catch-all email mailbox receives email messages sent to nonexistent addresses under the very same domain name. For example, a message sent to the misspelled suport@domain.com will be delivered to support@domain.com if the catch-all feature has been enabled for the latter. In this way, you can get emails from buddies or customers who may have sent a message to your email address with a spelling mistake or to an out-of-date one, which they may still have, but you have already deleted. Only one single mailbox per domain can be a catch-all one and email forwarding cannot be activated for such a mailbox. The latter is due to the fact that at some moment you may start receiving spam email messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be delivered to a third-party mailbox.