A catch-all email mailbox receives email messages sent to inactive addresses under the same domain. For example, an email sent to the miswritten suport@domain.com will go to support@domain.com in case the catch-all feature has been activated for the latter. In this way, you can get emails from partners or customers who may have sent a message to your email address with a typographical error or to an old one, which they may still have, but you have already disabled. Only one mailbox per domain 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 some point you may begin receiving spam email messages in the catch-all mailbox and the forwarding limitation implies that the spam will not be sent to a third-party mailbox.