Big Churn in the U.S. in October SpamRankings.net

Big churn in the U.S. for October 2011 in included last month's winner by spam volume vanishing, Comcast retaking the top spot but with only 2 out of the top 10, and colo FDCservers.net AS 30058 joining in at number ten.

All that and Numbers 2 and 3 didn't even place last month. #3 AS 25653 FORTRESSITX jumped up from about a thousand spam messages a day to more than 200,000 and then back down. #2 AS 23376 APPSERVE came up from zero on 11 October to more than 225,000, dropped back briefly to zero on 22 October, and then resumed at around 65,000 a day. Both of those cases look suspiciously like single botnet infestations.

Comcast may be making some effort to reduce outbound spam. In July Comcast held 5 out of the top 10 US rankings; in August it held 4, in September it held 3, and in October only 2.

-jsq