Virus Bulletin tested the different products against a total of 140,800 emails 137,889 of which were spam. Sophos performed superbly, achieving a 99.91% spam catch rate with no false alarms. This meant Sophos appeared in the very top right corner of Virus Bulletins spam quadrant, and outperformed a number of competitors. The company’s anti-spam software was tested over 16 consecutive days in March 2011. It is the latest in a long-running series of articles published by Naked Security.”]
Source: https://grahamcluley.com/sophos-wins-vb-anti-spam-comparative-test/