A catch-all feature that is activated for a particular mailbox will permit you to receive emails that are sent to email addresses that do not really exist. To put it differently, if you deactivate an email address and someone still sends a message to it, or to any miswritten email address under the very same domain, you will get the message in the catch-all mailbox. Using this feature means that you won’t miss an email for any reason whatsoever, which could be essential if you run a business, for example. Since you may begin receiving junk email messages, you can use the catch-all option with anti-spam filtering software in order to get only legitimate email messages in your inbox. Just one single mailbox per domain can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.