On the left is a list of the most common domains from emails used by spammers, in order of frequency. If you block new registrations from these domains it should limit spammers. This list is generated nightly from our database, and excludes legit domains like yahoo.com and gmail.com.
On the right is a list of the most prolific IP addresses in order of frequency.
Visit our downloads page if you'd like either list in CSV format.
