What you ask for is IMPOSSIBLE to determine. There are simply too many variables and to
make matters worse, this is a global village. Nobody maintains public records. And there
private networks and forums that exceed your wildest imagination--such as .mil for US
military when generates millions of transactions a day. I consulted my Ouija board to
conjure up a rough estimate per day: 4.7 billion world-wide transactions a day (including
SPAM).
There's simply no way to ever determine how many mailing lists exists or how large these
would be. I have over 50 names in my dinky little mailing list alone. LockerGnome, on the
other hand, sends out 300,000+ issues a day.
Again, what you ask for is IMPOSSIBLE. Not even the United States National Security
Agency (NSA) at Fort Meade, MD could give you a reliable figure, and it acquires and
analyzes all civilian and military email posting for the existence of certain keywords.