If you go to Site Manager -> Settings -> System and fill in an e-mail address into the Error notification e-mail address, notifications about internal errors in Kentico CMS system will be sent to this address whenever such an error occurs.
The e-mail address specified in the No-reply e-mail address field will be used as the sender ('From') e-mail address.
Page url: http://devnet.kentico.com/docs/devguide/index.html?system_error_notifications.htm