A catch-all feature that is activated for a certain mailbox will allow you to receive email messages that are sent to email addresses that do not really exist. To state it differently, if you disable an email address and someone still sends an email to it, or to any misspelled email address under the very same domain name, you will receive the message in the catch-all mailbox. Using this feature means that you won’t miss an email for any reason, which could be essential in case you run some company, for example. Since you may start receiving spam messages, you can combine the catch-all option with anti-spam filtering software so as to receive only legitimate messages in your inbox. Just one single mailbox per domain can be a catch-all one and email forwarding cannot be enabled for a catch-all mailbox.