A catch-all functionality that is activated for a specific email mailbox will allow you to receive email messages that are sent to addresses that do not really exist. Otherwise put, if you remove an email address and someone still sends a message to it, or to any mistyped address under the very same domain name, you will get the message in the catch-all mailbox. Using this functionality implies that you will no longer miss an email for any reason, which could be vital in case you run a business, for example. Since you may begin receiving spam email messages, you can combine the catch-all feature with anti-spam filtering software so as to receive only real email messages in your inbox. Just one mailbox per domain can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.