Where spam comes from: US, Korea, China, Canada

Annual survey by Sophos found that together United States and South Korea generate majority of spam. The survey was concerned with the physical locations of the servers, not the citizenship of the spammers themselves.

Country Spam share
United States 42.11%
South Korea 13.43%
China (including Hong Kong) 8.44%
Canada 5.71%
Brazil 3.34%
Japan 2.57%
France 1.37%
Spain 1.18%
United Kingdom 1.13%
Germany 1.03%
Taiwan 1.0%
Mexico 0.89%
Source: Sophos