A catch-all functionality that is enabled for a given email mailbox will permit you to receive email messages that are sent to email addresses that do not really exist. Otherwise stated, if you deactivate an email address and someone still sends a message to it, or to any miswritten address under the exact same domain, you’ll receive the email in the catch-all mailbox. Using this functionality implies that you won’t miss an email for any reason, which could be vital if you are running a business, for instance. Since you may start receiving junk email messages, you can combine the catch-all option with anti-spam filtering software in order 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.