A catch-all mailbox receives email messages sent to invalid email addresses under the exact same domain name. For instance, an email sent to the misspelled suport@domain.com will go to support@domain.com in case the catch-all feature has been enabled for the latter. Thus, you can get messages from pals or customers who may have sent a message to your email address with a spelling mistake or to an out-of-date one, which they may still have, but you have already deactivated. 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 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.