The Spamhaus Project

Spamhaus strengthens trust and safety for the Internet. Advocating for change through sharing reliable intelligence and expertise. As the authority on IP and domain reputation data, we are trusted across the industry because of our strong ethics, impartiality, and quality of actionable data. This data not only protects but also provides signal and insight across networks and email worldwide. 
With over two decades of experience, our researchers and threat hunters focus on exposing malicious activity to make the internet a better place for everyone. A wide range of industries, including leading global technology companies, use Spamhaus' data; currently protecting over 4.5 billion mailboxes worldwide.

Website: https://www.spamhaus.org
Threat Intel Community: https://submit.spamhaus.org
LinkedIn: https://www.linkedin.com/company/the-spamhaus-project
Twitter: https://twitter.com/spamhaus