A catch-all email mailbox receives emails sent to nonexistent addresses under the same domain. For example, an email message sent to the miswritten email@example.com will go to firstname.lastname@example.org if the catch-all feature has been activated for the latter. In this way, you can receive messages 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 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 start receiving spam email messages in the catch-all mailbox and the forwarding limitation means that the spam will not be received in a third-party mailbox.