A catch-all email mailbox receives emails sent to nonexistent email addresses under the exact same domain name. For instance, an email message sent to the mistyped 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 email messages from friends or clients who may have sent a message to your email address with a spelling error or to an obsolete 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. The latter is due to the fact that at a certain moment you may begin receiving spam messages in the catch-all mailbox and the forwarding limitation implies that the spam will not be sent to a 3rd-party mailbox.