A catch-all feature that is enabled for a certain mailbox will allow you to receive email messages that are sent to addresses that do not actually exist. To put it differently, if you disable an email address and someone still sends a message to it, or to any miswritten email address under the exact same domain, you’ll get the message in the catch-all mailbox. Using this feature implies that you won’t miss an email for any reason whatsoever, which could be crucial in case you run a company, for example. Since you may begin receiving junk email messages, you can use the catch-all option with anti-spam filters so as to get only legitimate emails in your inbox. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.