A catch-all mailbox receives messages sent to nonexistent addresses under the same domain name. For instance, an email message sent to the misspelled firstname.lastname@example.org will be delivered to email@example.com in case the catch-all feature has been activated for the latter. In this way, you can get emails from colleagues or clients who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already deactivated. Just 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 some moment you may start receiving spam emails in the catch-all mailbox and the forwarding restriction means that the spam will not be sent to a third-party mailbox.