A catch-all email mailbox receives email messages sent to non-existent addresses under the same domain name. For example, an email sent to the miswritten firstname.lastname@example.org will be delivered to email@example.com in case the catch-all feature has been enabled for the latter. In this way, you can get email messages from buddies or clients who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already disabled. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be activated for such a mailbox. This is due to the fact that at a certain moment you may start receiving spam messages in the catch-all mailbox and the forwarding limitation means that the spam will not be received in a third-party mailbox.