The CBL - Composite Blocking List
CBL Statistics CBL FAQ
CBL HOME Privacy Policy

Spam Trap Flow Statistics

These graphs are total email flow into one of our larger (but not nearly largest) spamtraps. This is intended to give a reasonably representative indication of overall spam flow.

The Y axis is emails per second. "5.0k" means 5000 emails/second. For each 1000 emails/second this trap averages over a day, the total is another 86 million emails/day. For example, a 5000 emails/second average over a day represents 432 million emails per day.

The X axis is the date/time in GMT.

No attempt is made to distinguish spam from non-spam email hitting the trap. For example, the total flow numbers will undoubtably include "backscatter". Backscatter is where spam is created with a forge sender address, and is sent to a mail server that rejects the email by a bounce - to the forged address. The CBL does not list IP addresses for this reason, but other DNSBLs do.

Generally speaking, more than 95% of the hits represented in this graph result in a CBL listing.

One of the more important things to take away from these graphs is the highly cyclic volume of spam being sent.

Note also the abrupt dip at Dec/Jan of 2010/2011, and March 2011. The first was when the Rustock bot operator seemed to go on holiday for almost two weeks. The second was when the Rustock bot was finally killed.

The CBL and web pages are copyright © 2003-2016, all unauthorized copying is prohibited