A catch-all functionality that is activated for a certain mailbox will permit you to receive emails that are sent to addresses that do not actually exist. Otherwise stated, if you disable an email address and someone still sends a message to it, or to any miswritten address under the same domain name, you’ll get the message in the catch-all mailbox. Using this functionality means that you won’t miss an email for any reason, which could be essential in case you run a business, for instance. Since you may start receiving unsolicited bulk email messages, you can combine the catch-all feature with email filters so as to get only legitimate emails in your inbox. Just one mailbox per domain can be a catch-all one and email forwarding cannot be activated for a catch-all mailbox.