A catch-all email mailbox receives emails sent to non-existent addresses under the exact same domain name. For example, an email message 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. Thus, you can receive messages from buddies or clients 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 name can be a catch-all one and email forwarding cannot be enabled for such a mailbox. This is due to the fact that at some point you may begin receiving spam email messages in the catch-all mailbox and the forwarding restriction implies that the spam will not be delivered to a 3rd-party mailbox.