Microsoft Smart Network Data Services (SNDS) is a free service Microsoft offers to senders that provides high-level insight on how subscribers rate the email they receive as well as the health of an IP address as viewed by the Outlook.com system. SNDS provides data based on actual email sent to Outlook.com subscribers.
The metrics include:
- Spam complaints
- SmartScreen filter results
- Spam trap hits
SNDS data can help improve your understanding of how the Outlook.com filters and users rate your email.