A catch-all mailbox receives email messages sent to non-existent email addresses under the same domain name. For instance, an email message sent to the misspelled email@example.com will be delivered to firstname.lastname@example.org in case the catch-all feature has been activated for the latter. Thus, you can get email messages from friends or clients who may have sent a message to your email address with a typographical error or to an out-of-date one, which they may still have, but you have already deleted. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be set up for such a mailbox. This is due to the fact that at a certain point you may begin receiving spam email messages in the catch-all mailbox and the forwarding limitation implies that the spam will not be re-sent to a third-party mailbox.