A catch-all email mailbox receives messages sent to inactive email addresses under the same domain. For example, an email sent to the misspelled firstname.lastname@example.org will be delivered to email@example.com if the catch-all feature has been enabled for the latter. In this way, you can receive messages from pals or clients who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already deleted. Just 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 a certain 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 third-party mailbox.