A catch-all functionality that is activated for a certain mailbox will allow you to receive emails that are sent to email addresses that do not actually exist. Otherwise stated, if you disable an email address and somebody still sends a message to it, or to any mistyped email address under the exact same domain, you’ll get the email in the catch-all mailbox. Using this feature means that you won’t miss an email for any reason, which could be essential if you are running some company, for example. Since you may start receiving spam, you can combine the catch-all feature with anti-spam filters in order to receive only authentic messages in your inbox. Just one single mailbox per domain name can be a catch-all one and email forwarding cannot be activated for a catch-all mailbox.