Top 10 Countries of Spam Origin

During the second half of 2007, 42% of all spam originated in the United States, a decrease from 50% in the previous period. Despite the decrease, the United States had an 8% increase in volume of spam messages. The drop in percentage from the United States can be explained by the increase in volume of spam originating in other countries -- namely, Russia. The prominence of the United States is not surprising, given that it has the highest number of broadband Internet users in the world. The United States was the top country of spam origin for the first half of 2007 as well as the last half of 2006.

Source: Symantec Internet Security Threat Report, Vol. XIII