A catch-all functionality that is enabled for a particular email mailbox will allow you to receive emails that are sent to addresses that do not really exist. Otherwise said, if you remove an email address and somebody still sends an email message to it, or to any miswritten email address under the exact same domain, you’ll receive the message in the catch-all mailbox. Using this feature implies that you will no longer miss an email for any reason, which could be vital in case you run some business, for instance. Since you may begin receiving spam, you can use the catch-all feature with email filters so as to receive only legitimate emails in your inbox. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be activated for a catch-all mailbox.