There have been several incidents over the past year, acknowledged by senior ReturnPath management, where Yahoo! was not honoring the contractual promise of direct inbox placement of email traffic from Certified IPs in good standing. Large amounts of Certifed traffic were being bulked by Yahoo!. One of the reasons I was told was due to Yahoo! applying engagement metrics to the certified traffic. This totally defeats the purrpose for paying Return Path $185,000 a year to 'whitelist' our email.