A catch-all email mailbox receives email messages sent to nonexistent addresses under the same domain name. For example, an email 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 receive emails from partners or customers who may have sent a message to your email address with a typographical error or to an obsolete one, which they may still have, but you have already deactivated. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be activated for such a mailbox. This is due to the fact that at some moment you may begin receiving spam email messages in the catch-all mailbox and the forwarding restriction means that the spam will not be sent to a third-party mailbox.