A catch-all mailbox receives email messages sent to non-existent email addresses under the same domain name. For example, an email message sent to the misspelled [email protected] will go to [email protected] if the catch-all feature has been activated for the latter. In this way, you can get emails from acquaintances or clients who may have sent a message to your email address with a typographical error or to an old one, which they may still have, but you have already deleted. Just one mailbox per domain 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 moment you may start receiving spam messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be sent to a 3rd-party mailbox.