Spams with misleading or incorrect headers or subject lines are illegal under California law: SB 1457 Senate Bill - ENROLLED.
Convert Group aka accomplishmoretoday.com aka Total Response Group Wall Street News Alert spams. Lance Armstrong spam, etc.
This is interesting reading:
Behind Enemy Lines - Premier Services Exposed contains actual emails from a pump and dumper (Mark Rice) conversing with the spamming outfit he uses (see Rodona Garst Learns Pump-N-Dump and Insider Stock Trading)