A catch-all mailbox receives messages sent to non-existent addresses under the very same domain name. For instance, an email message sent to the mistyped suport@domain.com will go to support@domain.com in case the catch-all feature has been enabled for the latter. In this way, you can receive messages from mates or customers who may have sent a message to your email address with a typo or to an old one, which they may still have, but you have already disabled. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be set up for such a mailbox. This is so because of the fact that at some moment you may begin receiving spam emails in the catch-all mailbox and the forwarding limitation implies that the spam will not be delivered to a 3rd-party mailbox.