A catch-all email mailbox receives emails sent to nonexistent email addresses under the exact same domain name. For instance, a message sent to the mistyped firstname.lastname@example.org will go to email@example.com if the catch-all feature has been activated for the latter. In this way, you can get messages from partners or customers who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already deactivated. Only one single mailbox per domain name 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 some point you may begin receiving spam messages in the catch-all mailbox and the forwarding limitation implies that the spam will not be delivered to a 3rd-party mailbox.