A catch-all email mailbox receives email messages sent to inactive email addresses under the exact same domain name. For example, an email message sent to the misspelled suport@domain.com will be delivered to support@domain.com in case the catch-all feature has been enabled for the latter. Thus, you can receive emails from friends or clients who may have sent a message to your email address with a typographical error or to an outdated one, which they may still have, but you have already deleted. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be set up for such a mailbox. The latter is due to the fact that at a certain point you may begin receiving spam emails in the catch-all mailbox and the forwarding restriction implies that the spam will not be redirected to a third-party mailbox.