A catch-all email mailbox receives messages sent to invalid addresses under the very same domain name. For instance, an email message sent to the misspelled firstname.lastname@example.org will go to email@example.com if the catch-all feature has been enabled for the latter. In this way, you can receive emails from colleagues or customers who may have sent a message to your email address with a spelling mistake or to an obsolete one, which they may still have, but you have already deactivated. Just one mailbox per domain can be a catch-all one and email forwarding cannot be set up for such a mailbox. This is due to the fact that at a certain moment you may begin receiving spam emails in the catch-all mailbox and the forwarding restriction means that the spam will not be redirected to a 3rd-party mailbox.