A catch-all functionality that is enabled for a particular mailbox will allow you to receive emails that are sent to addresses that do not really exist. Otherwise stated, if you remove an email address and somebody still sends an email to it, or to any miswritten email address under the very same domain name, you will receive the email in the catch-all mailbox. Using this feature means that you won’t miss an email for any reason whatsoever, which could be crucial if you are running a business, for example. Since you may start receiving junk email messages, you can combine the catch-all option with anti-spam filtering software so as to get only authentic email messages in your inbox. Only one single mailbox per domain can be a catch-all one and email forwarding cannot be activated for a catch-all mailbox.