An Australian man under investigation for illegal spamming <A HREF="http://news.yahoo.com/s/ap/20060913/ap_on_fe_st/viagra_spam">sent more than 2 billion emails</A> promoting Viagra in a year, an official said Wednesday. Experts say that's a drop in the ocean compared to the number of spam emails sent globally each year, and the system he used probably wasn't very sophisticated. Under Australia's Spam Act of 2003, it is illegal for Australian residents to be involved in the sending of unsolicited commercial emails, even if they are generated from outside the country.