A catch-all functionality that is enabled for a particular mailbox will permit you to receive email messages that are sent to addresses that do not actually exist. To put it differently, if you disable an email address and somebody still sends a message to it, or to any mistyped email address under the very same domain name, you’ll receive the email in the catch-all mailbox. Using this functionality implies that you will no longer miss an email for any reason, which could be essential if you run a business, for example. Since you may start receiving unsolicited email messages, you can combine the catch-all functionality with anti-spam filters in order to get only legitimate messages in your inbox. Just one mailbox per domain name can be a catch-all one and email forwarding cannot be activated for a catch-all mailbox.