The reason why there is a discrepancy is because:
- Yahoo! shares all complaint data with Validity. Validity reports the data through Everest and the Daily Performance Report.
- Yahoo!, however, directly reports only select complaint data from its Complaint Feedback Loop to senders, which senders can use to identify content that subscribers do not want and to improve their mailing practices.
As a result, Yahoo!'s Complaint Feedback Loop complaints are always less than the complaints shown in the Certification data.
Yahoo! has confirmed that counts of both the aggregate complaints in the Daily Performance Report and Yahoo!'s Complaint Feedback Loop message reports are accurate.
