A catch-all email mailbox receives messages sent to non-existent addresses under the same domain name. For instance, a message sent to the miswritten email@example.com will go to firstname.lastname@example.org in case the catch-all feature has been activated for the latter. In this way, you can receive email messages from buddies or customers who may have sent a message to your email address with a spelling error or to an out-of-date one, which they may still have, but you have already disabled. Only one mailbox per domain name 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 start receiving spam messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be delivered to a 3rd-party mailbox.