A catch-all mailbox receives emails sent to invalid addresses under the same domain. For instance, a message sent to the miswritten email@example.com will be delivered to firstname.lastname@example.org if the catch-all feature has been activated for the latter. Thus, you can receive messages from pals or customers who may have sent a message to your email address with a typographical error or to an outdated one, which they may still have, but you have already deleted. Just one single mailbox per domain 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 a certain point you may begin receiving spam messages in the catch-all mailbox and the forwarding limitation implies that the spam will not be redirected to a third-party mailbox.