A catch-all functionality that is activated for a certain email mailbox will allow you to receive email messages that are sent to addresses that do not really exist. To put it differently, if you remove an email address and somebody still sends a message to it, or to any mistyped email address under the same domain name, you’ll receive the message in the catch-all mailbox. Using this feature implies that you will no longer miss an email for any reason whatsoever, which could be crucial in case you are running some company, for instance. Since you may start receiving junk email messages, you can combine the catch-all functionality with email filters so as to get only real emails in your inbox. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.