Enterprise Spam at 90% of Email Volume, Attachment-based Spam Up

December 27, 2007

This article is included in these additional categories:


Spam continues to account for nearly 90% of the total email volume received by large enterprises, and attachment-based spam made a comeback, according to November data collected by Proofpoint, Inc. (via MediaPost).

The Proofpoint Spam Index was at 88.17% in November, indicating again that nearly 9 of 10 email messages delivered to large enterprises were spam, though down slightly from October’s index of 89.04%.

Spam base on attachments – e.g., image, PDF and Microsoft Word files – increased in November over October levels, Proofpoint found:

  • Image-based spam continued to rise for the second consecutive month, increasing to 10.0% of total spam volume, up 23.8% over October.
  • Microsoft Word document spam (.doc attachments) rose by 64.6% over October levels and accounted for 4.7% of total spam volume.
  • Microsoft Word document spam in .rtf format also increased, accounting for 0.62% of total spam volume (a 265% increase over October levels).
  • PDF spam, while still a very small percentage of total spam volume, rose to its highest levels since September: Up 101% over October levels and accounting for nearly 1.8% of total spam volume.
  • MP3 spam (the spammer’s message is attached as an MP3 format audio file) declined since its debut in October, accounting for just 0.04% of total spam volume – down by 33.33%.

About the data: The Proofpoint Spam Index is a measure of the average amount of spam hitting the typical enterprise, university or government agency. The index is an average of actual spam volumes observed by Proofpoint systems deployed at a variety of customer sites, representing large organizations across a range of vertical industries, including financial services, healthcare, higher education, manufacturing and business services.


Explore More Articles.

Marketing Charts Logo

Stay on the cutting edge of marketing.

Sign up for our free newsletter.

You have Successfully Subscribed!

Pin It on Pinterest

Share This