A catch-all email mailbox receives emails sent to non-existent addresses under the same domain name. For example, an email message sent to the mistyped firstname.lastname@example.org will go to email@example.com if the catch-all feature has been activated for the latter. In this way, you can receive email messages from friends or customers who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already deactivated. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be enabled for such a mailbox. The latter is due to the fact that at some moment you may start receiving spam messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be redirected to a 3rd-party mailbox.