A catch-all feature that is activated for a given mailbox will allow you to receive emails that are sent to email addresses that do not really exist. To state it differently, if you delete an email address and somebody still sends an email message to it, or to any mistyped address under the same domain, you’ll receive the email in the catch-all mailbox. Using this feature means that you will no longer miss an email for any reason, which could be vital if you run some company, for example. Since you may start receiving junk email messages, you can use the catch-all option with anti-spam filters in order 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.