Yahoo Complaint Feedback Loop utilizes DKIM

The Complaint Feedback Loop program supports DKIM-signed email. If you’re already signing emails with this authentication technology and want to enroll in the program, visit postmaster.yahoo.com to learn more, or submit a Complaint Feedback Loop application to create and manage your account.

  Note - The Complaint Feedback Loop program is a domain based service. IP address based feedback loops aren't supported.