Since its inception, the IronPort Threat Operations Center has been tracking worldwide spam volume. Changes in spam volume can be attributed to numerous factors including the variety of methods used by spammers and capture rates due to the ability (or inability) of anti-spam solutions to keep up with rapidly changing techniques.

The graph below expresses the number of spam messages over a specified amount of time. The table contains additional vectors to help show how spam relates to global email volume and its own average statistics.

Global spam volume
Date Spam Volume (Billions) % of Global Email Volume Spam Volume Change 2009 Jul 04 192.9 87.6% -19% 2009 Jul 03 238.4 86.8% 46% 2009 Jul 02 162.7 86.8% -36% 2009 Jul 01 253.9 86.7% 9% 2009 Jun 30 232.9 86.9% 27% 2009 Jun 29 183.8 88.6% -8% 2009 Jun 28 200.0 88.5% -16%