A catch-all mailbox receives email messages sent to non-existent addresses under the same domain. For example, an email message sent to the mistyped suport@domain.com will be delivered to support@domain.com if the catch-all feature has been activated for the latter. In this way, you can get messages from acquaintances or customers who may have sent a message to your email address with a typographical error or to an outdated one, which they may still have, but you have already disabled. Only one single mailbox per domain name can be a catch-all one and email forwarding cannot be enabled 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 re-sent to a third-party mailbox.