A catch-all feature that is activated for a particular mailbox will allow you to receive emails that are sent to addresses that do not really exist. In other words, if you deactivate an email address and someone still sends an email message to it, or to any misspelled email address under the exact same domain name, you will get the email in the catch-all mailbox. Using this feature means that you won’t miss an email for any reason whatsoever, which could be crucial in case you are running a business, for example. Since you may start receiving unsolicited bulk emails, you can use the catch-all feature with anti-spam filters so as to get only legitimate email messages in your inbox. Only one mailbox per domain name can be a catch-all one and email forwarding cannot be enabled for a catch-all mailbox.