Hey Dude,
since I've spent much hard work myself to get these addys and I've also hired two girls each for one month to help me collect this emails Im only able to tell you so much:
All email addy's belong to very big MNC's (multinational companies) and some to different government- research institutions...
each of these companies have at least 20, but even upto 25000 employees.
I'm selling 7 different products in the range from 1000US$ -27000 (twentyseven-thousand)US$.
None or almost none of these addys, (max. 20 out of 10000) are google/hotmail/freeaccounts.....
so long,J