Dnswl.org provides reputation information about email senders and is the leading whitelist provider for email filtering. It has over 100’000 users (companies, organisations and individuals) and contains close to 275’000 entries of “good mailservers”, including a fast growing amount of IPv6 entries.

More than 2 million distinct IP addresses query our data every day, and more than 100’000 IP addresses query us with high volumes (in the tens of thousands of requests each day).