How tall would it be?

C

Don't know but what's the betting there are more or just as many letters and symbols in these 650,000 emails as there are genetic DNA sequences in the human genome.

Incredible amount, but you know what they say, if you wanna hide something without actually having to hide it, just mix it with allot more of the ordinary.

Is it she alone writing the emails or a whole office like Pentagon writing them?

please tell us how thick you think ONE sheet of paper would be. Once you find that out multiply that by 650 000