A catch-all feature that is enabled for a given mailbox will permit you to receive emails that are sent to email addresses that do not actually exist. In other words, if you deactivate an email address and somebody still sends an email to it, or to any mistyped email address under the very same domain, you’ll get the email in the catch-all mailbox. Using this functionality means that you won’t miss an email for any reason whatsoever, which could be essential in case you are running some business, for example. Since you may begin receiving unsolicited messages, you can combine the catch-all option with email filters so as to get only authentic email messages in your inbox. Just one mailbox per domain name can be a catch-all one and email forwarding cannot be enabled for a catch-all mailbox.