A catch-all functionality that is activated for a certain e-mailbox will allow you to receive email messages that are sent to addresses that do not actually exist. Otherwise put, if you remove an email address and someone still sends a message to it, or to any miswritten address under the exact same domain, you will get the email in the catch-all mailbox. Using this functionality implies that you won’t miss an email for any reason whatsoever, which could be crucial in case you run some business, for example. Since you may start receiving spam emails, you can combine the catch-all option with anti-spam filters so as to get only authentic emails in your inbox. Only one single mailbox per domain can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.