A catch-all feature that is enabled for a specific mailbox will allow you to receive emails that are sent to addresses that do not really exist. Otherwise put, if you deactivate an email address and somebody still sends an email to it, or to any miswritten address under the very same domain name, you’ll get the email in the catch-all mailbox. Using this functionality implies that you will no longer miss an email for any reason whatsoever, which could be essential in case you run some company, for example. Since you may begin receiving unsolicited bulk messages, you can use the catch-all functionality with anti-spam filtering software in order to get only legitimate email messages in your inbox. Only one single mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.