A catch-all email mailbox receives messages sent to invalid email addresses under the very same domain name. For instance, an email sent to the miswritten firstname.lastname@example.org will go to email@example.com if the catch-all feature has been enabled for the latter. In this way, you can get email messages from partners or customers who may have sent a message to your email address with a typo or to an outdated one, which they may still have, but you have already deactivated. Just one mailbox per domain can be a catch-all one and email forwarding cannot be activated for such a mailbox. This 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 sent to a third-party mailbox.