A catch-all functionality that is enabled for a specific email mailbox will permit you to receive emails that are sent to email addresses that do not actually exist. Otherwise put, if you disable an email address and someone still sends a message to it, or to any miswritten email address under the same domain name, 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 company, for instance. Since you may start receiving unsolicited email messages, you can use the catch-all feature with anti-spam filters so as to receive only real messages in your inbox. Only one single mailbox per domain name can be a catch-all one and email forwarding cannot be set up for a catch-all mailbox.