A catch-all email mailbox receives email messages sent to inactive email addresses under the very same domain. For instance, a message sent to the misspelled email@example.com will go to firstname.lastname@example.org in case the catch-all feature has been activated for the latter. Thus, you can receive emails from mates or customers 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 deactivated. Just one single mailbox per domain can be a catch-all one and email forwarding cannot be enabled for such a mailbox. This is due to the fact that at a certain moment you may begin receiving spam email messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be redirected to a third-party mailbox.