Pump and Dump spams are part of a financial fraud scheme. . Aside of the usual spam reporting one can also report the practice to the appropriate official contacts.

Due to the global nature of this spam one needs to have a list of which address to report to.

USA: SEC:

• SEC wants your stock related spam
• Forward the spam to enforcement(AT)sec.gov
• You get a standardized reply for every report, typically during the next business day

Germany: Bafin

• poststelle-ffm(AT)bafin.de

Australia: ASIC (oversight) and ASX (stock exchange)

• ASIC has a form, way too impractical for dealing with individual spam messages
• info(AT)asx.com.au

If you have confirmed and working responsive addresses for other stock exchanges, please let us know.

Links:
http://en.wikipedia.org/wiki/Pump_and_dump
http://www.sec.gov/complaint.shtml

Thanks to our readers Axel and more for reporting in on this.
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Swa Frantzen -- NET2S