A catch-all mailbox receives messages sent to invalid addresses under the same domain name. For example, an email message sent to the miswritten firstname.lastname@example.org will go to email@example.com in case the catch-all feature has been activated for the latter. In this way, you can get email messages from pals or clients who may have sent a message to your email address with a typographical error or to an outdated one, which they may still have, but you have already deactivated. Just one single mailbox per domain can be a catch-all one and email forwarding cannot be set up for such a mailbox. This is due to 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 sent to a 3rd-party mailbox.