Did the CRU emails come from an insider?

Who leaked the Hadley CRU files and why

In all that time, the original poster of the Russian FTP link never made another comment in any forum. As discussed above, this is not typical of a hacker. A hacker would be boasting about his act, and loudly. Instead, his file sat in that anonymous FTP account for more than forty-eight hours, and the poster never made any further attempt to publicize his find. Hence the conclusion, by this Examiner and a host of other commenters, including IP security professionals, that this unknown user was one who had had access to CRU computers, in accordance with his duties at the CRU. [Via Flopping Aces]