A catch-all mailbox receives emails sent to invalid addresses under the very same domain name. For instance, an email 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 get messages from acquaintances or customers who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already deleted. Only one 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 begin receiving spam emails in the catch-all mailbox and the forwarding restriction means that the spam will not be delivered to a 3rd-party mailbox.