A catch-all functionality that is enabled for a particular email mailbox will allow you to receive emails that are sent to addresses that do not actually exist. To put it differently, if you delete an email address and someone still sends a message to it, or to any mistyped email address under the 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, which could be vital in case you run some business, for example. Since you may begin receiving unsolicited messages, you can use the catch-all functionality with anti-spam filters so as to get only authentic emails in your inbox. Only one single mailbox per domain can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.