It is impossible for the Guardian to verify the authenticity of the emails as a whole. It is quite possible that they are a mix of real emails from the regime plus intelligence agency injected disinfo, conveniently leaked as the drums for war against Syria line up for parade. Indeed, if you ran an intelligence agency, who would you 'leak' such a bundle of 'evidence' to? The courageous, crusading, twittering Guardian or the shunned, vulgar NWS stable?