A catch-all functionality that is activated for a particular mailbox will allow you to receive email messages that are sent to addresses that do not really exist. Otherwise stated, if you disable an email address and someone still sends an email message to it, or to any miswritten email address under the exact same domain, you will receive the message in the catch-all mailbox. Using this functionality implies that you will no longer miss an email for any reason whatsoever, which could be crucial if you are running some company, for example. Since you may begin receiving unsolicited messages, you can combine the catch-all option with anti-spam filters so as to get only authentic messages in your inbox. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.