A catch-all mailbox receives email messages sent to inactive addresses under the exact same domain name. For example, a message sent to the misspelled firstname.lastname@example.org will go to email@example.com in case the catch-all feature has been enabled for the latter. In this way, you can receive email messages from pals or clients who may have sent a message to your email address with a spelling mistake or to an out-of-date one, which they may still have, but you have already deactivated.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 some moment you may begin receiving spam email messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be received in a 3rd-party mailbox.