A catch-all feature that is enabled for a given e-mailbox will allow you to receive email messages that are sent to addresses that do not really exist. Otherwise put, if you delete an email address and someone still sends an email message to it, or to any mistyped email address under the same domain, you will get the message in the catch-all mailbox. Using this feature means that you will no longer miss an email for any reason, which could be vital in case you run some business, for example. Since you may start receiving unsolicited emails, you can use the catch-all option with anti-spam filtering software 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.