A system that monitors for an initiation of the sending of an electronic message. The user is alerted or warned that the message is about to be sent. The alert includes a list of the addressees of the message. The list includes addressee aliases where available. The sender can then verify that the addressees are correct and change or delete those on the list, or erase the message. The system also provides such an alert when a computer initiates the sending of an unauthorized message and allows the user to delete the unauthorized message.