A catch-all functionality that is activated for a particular mailbox will permit you to receive emails that are sent to addresses that do not really exist. To state it differently, if you delete an email address and someone still sends an email message to it, or to any mistyped email address under the 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 whatsoever, which could be vital in case you are running a business, for example. Since you may begin receiving spam email messages, you can combine the catch-all option with email filters so as to receive only real emails in your inbox. Just one mailbox per domain can be a catch-all one and email forwarding cannot be enabled for a catch-all mailbox.