A catch-all email mailbox receives messages sent to non-existent email addresses under the same domain name. For instance, an email sent to the misspelled 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 receive email messages from pals or customers who may have sent a message to your email address with a typographical error or to an outdated one, which they may still have, but you have already deleted. Only one mailbox per domain can be a catch-all one and email forwarding cannot be activated for such a mailbox. This is so because of the fact that at some point you may begin receiving spam messages in the catch-all mailbox and the forwarding restriction means that the spam will not be redirected to a third-party mailbox.