A catch-all functionality that is activated for a specific email mailbox will permit you to receive emails that are sent to email addresses that do not actually exist. Otherwise stated, if you remove an email address and somebody still sends an email to it, or to any misspelled address under the very same domain, you’ll receive the email in the catch-all mailbox. Using this functionality means that you will no longer miss an email for any reason, which could be vital if you are running a business, for instance. Since you may start receiving junk emails, you can combine the catch-all option with anti-spam filters so as to receive only legitimate messages in your inbox. Only one single mailbox per domain name can be a catch-all one and email forwarding cannot be activated for a catch-all mailbox.