A catch-all email mailbox receives messages sent to invalid addresses under the very same domain name. For example, an email sent to the mistyped suport@domain.com will go to support@domain.com if the catch-all feature has been enabled for the latter. In this way, you can receive email messages from partners or clients 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 deactivated. Only one single mailbox per domain 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 a certain moment you may begin receiving spam emails in the catch-all mailbox and the forwarding limitation means that the spam will not be delivered to a 3rd-party mailbox.