A catch-all feature that is enabled for a particular mailbox will allow you to receive emails that are sent to addresses that do not actually exist. Otherwise stated, if you disable an email address and someone still sends an email to it, or to any mistyped email address under the same domain name, you will receive 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 essential if you run some business, for instance. Since you may start receiving unsolicited email messages, you can use the catch-all feature with anti-spam filtering software so as to get only legitimate email 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.