A catch-all email mailbox receives email messages sent to inactive email addresses under the very same domain name. For example, an email sent to the miswritten firstname.lastname@example.org will be delivered to email@example.com if the catch-all feature has been activated for the latter. In this way, you can receive messages from mates or clients who may have sent a message to your email address with a typographical error or to an obsolete one, which they may still have, but you have already disabled. Just one single 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 start receiving spam emails in the catch-all mailbox and the forwarding limitation means that the spam will not be redirected to a third-party mailbox.