Email Hosting Providers

SPFSPF

SPF Usage Statistics · Download List of All Websites using SPF

The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery.

Sender IDSender ID

Sender ID Usage Statistics · Download List of All Websites using Sender ID

Sender ID is an anti-spoofing email framework heavily based on SPF.

Operating Systems and Servers
Copyright

Copyright InfringementCopyright Infringement

Copyright Infringement Usage Statistics · Download List of All Websites using Copyright Infringement

The site has had more than 10 successful copyright takedown requests since 2011.