Microsoft SNDS
Microsoft SNDS is a free web service for senders and internet service providers managing email deliverability and sending reputation with Outlook.com.
What Microsoft SNDS is
Microsoft SNDS is a free web service for senders and internet service providers managing email deliverability and sending reputation with Outlook.com. It provides data about individual IP addresses and shows how Outlook.com views the health of an IP space. The portal also includes the Junk Email Reporting Program, which can send reports when users mark messages as junk, and lets users manage feedback loop settings alongside IP data. SNDS can help IP owners identify compromised servers, malware, viruses, and botnets. Access requires signing in with a Microsoft Account and requesting authorization for the IP addresses the user manages. Network access expires 10 months after approval or migration, so owners need to reattest periodically. Data Reports no longer include trap hit counts starting July 22, 2026. The service offers sender reputation and blocklist monitoring, as well as API access; inbox placement and spam trap monitoring are not included. For urgent Outlook.com delivery issues, Microsoft advises contacting sender support with someone familiar with the issue and email infrastructure. The Smart Network Data Services (SNDS) plan costs nothing.
Good
- Provides individual IP data and IP-space health insight.
- Includes reports when users mark messages as junk.
- Combines IP data with feedback loop settings.
- Offers sender reputation and blocklist monitoring.
- Provides API access.
Watch out
- Requires Microsoft Account sign-in and authorization.
- Network access expires after 10 months.
- Does not provide inbox placement monitoring.
- Does not provide spam trap monitoring.
Who it suits
SNDS is for senders and ISPs responsible for Outlook.com email delivery and IP reputation. It is useful to IP owners who need reputation data, feedback loop settings, or reports about junk markings.
Verdict
SNDS brings Outlook.com IP reputation data and feedback loop settings into one free portal. Users should account for its authorization process and periodic ownership reattestation.
Plans and prices
From Microsoft SNDS's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Smart Network Data Services (SNDS) | Free | Free service for senders to view IP data and manage feedback loop settings |
The facts
Each one read from Microsoft SNDS's own pages, with the date it was checked.
What it does
- Abuse monitoring
- Microsoft says SNDS can help IP owners detect compromised servers, malware, viruses, and botnets.checked 8 Oct 2026
- Access
- Users sign in with a Microsoft Account and request access to the IPs for which they are responsible through an authorization process.checked 8 Oct 2026
- Data change
- Trap hit counts stopped being included in Data Reports starting July 22, 2026.checked 8 Oct 2026
- Feedback settings
- The portal lets users view IP data and manage feedback loop settings in one website.checked 8 Oct 2026
- Intended users
- Microsoft describes SNDS as a service for senders and ISPs managing email deliverability and sending reputation for Outlook.com consumers.checked 8 Oct 2026
- IP data
- The service gives senders detailed data about individual IPs and insight into the health of their IP space as viewed by Outlook.com.checked 8 Oct 2026
- Junk reports
- SNDS includes the Junk Email Reporting Program, which can send reports when users mark messages as junk.checked 8 Oct 2026
- Purpose
- SNDS provides data to help senders understand and improve their reputation at Outlook.com.checked 8 Oct 2026
- Security measure
- Network access expires 10 months after approval or migration, requiring periodic ownership reattestation.checked 8 Oct 2026
- Support
- For urgent Outlook.com delivery issues, Microsoft advises contacting sender support with someone familiar with the issue and email infrastructure.checked 8 Oct 2026
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