A system and method, where messages which are exchanged in email, provide recipients (and originators) with the capability to confirm authenticity. A substring of a message is examined, is validated and, if any modifications have been made, the modifications are highlighted to the originator and the receivers so that the originator and the receivers know that the original message has been modified. Also, the system and method of the present invention preserve the time, date and identity of the maker of the modifications.