A catch-all email mailbox receives emails sent to nonexistent addresses under the very same domain. For instance, a message sent to the mistyped suport@domain.com will go to support@domain.com if the catch-all feature has been enabled for the latter. Thus, you can receive emails from mates or customers who may have sent a message to your email address with a typo or to an out-of-date one, which they may still have, but you have already deactivated. Just one mailbox per domain name 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 a certain moment you may begin receiving spam messages in the catch-all mailbox and the forwarding limitation means that the spam will not be delivered to a third-party mailbox.