Worldwide Internet Mail Gateway Spam Percentage represents the number of messages that were processed and classified as spam versus the total number of messages processed when scanned at the mail gateway. This metric represents SMTP layer filtering and does not include the volumes of e-mail detected at the network layer.
Global Spam Categories
Spam category data is collected from classifications on messages passing through the Symantec Probe Network.
Regions of Origin
Region of origin represents the percentage of spam messages reported coming from certain regions and countries in the last 30 days.
Source: Symantec’s “The State of Spam Monthly Report” – January 2009.