A catch-all email mailbox receives messages sent to invalid addresses under the same domain. For instance, an email message sent to the miswritten email@example.com will go to firstname.lastname@example.org in case the catch-all feature has been enabled for the latter. In this way, you can receive emails from partners or customers who may have sent a message to your email address with a spelling mistake or to an obsolete one, which they may still have, but you have already deleted. Just one mailbox per domain name can be a catch-all one and email forwarding cannot be activated for such a mailbox. This is so because of the fact that at some moment you may begin receiving spam emails in the catch-all mailbox and the forwarding restriction implies that the spam will not be redirected to a third-party mailbox.