While the US was the single highest-ranking country in the study, Asia topped the list of continents with 36.6 per cent of the world's spam accounted for.
In the latter half of 2012, India had been leading the way but has now fallen back to third, with China leapfrogging into second place after a spell in the lower half of the list, statistics from SophosLabs revealed.
US is still firmly on the top, distributing more spam than any other country in the world, clocking in at a "respectable" 18.3 per cent of junk email sent.
Other high-ranking countries included Peru, France, South Korea, and Italy. North America ranked third, with a relatively diminutive 22 per cent, 'TechNewsDaily' reported.
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After the top two, the spammers are distributing their activities fairly evenly across the rest of the list.
Stepping back and looking at spam relay from a continental viewpoint shows Asia keeping the top spot that it has held for some time now.
The list included USA (18.3 per cent) at number one, China (8.2 per cent) at number two. India (4.2 per cent) was placed third while Peru (4.0 per cent) stood fourth in the list.
France (3.4 per cent), S Korea (3.4 per cent) and Italy (3.4 per cent) were placed fifth on the list. Taiwan (2.9 per cent) and Russia (2.9 per cent) were at the eighth position.
Spain (2.8 per cent), Germany (2.7 per cent) and Iran (2.6 per cent) were at tenth, eleventh and twelfth spot respectively.