A catch-all mailbox receives emails sent to inactive addresses under the very 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 enabled for the latter. In this way, you can get emails from acquaintances or customers who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already disabled.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 activated for such a mailbox. The latter is due to the fact that at a certain point you may start receiving spam emails in the catch-all mailbox and the forwarding limitation means that the spam will not be re-sent to a 3rd-party mailbox.