Microsoft SNDS
Microsoft SNDS: A free Microsoft-focused diagnostic service for IP reputation and Outlook.com filtering signals. Ranked #26 of 31 in Email Deliverability Software by our editors (6.5/10); pricing: Free plan; best for free Outlook.com IP reputation feedback.
At a glance
- Editor score6.5 / 10
- PricingFree plan
- Best forFree Outlook.com IP reputation feedback
- Free planYes
- Paid fromFree
- Inbox placement monitoringNo
- Facts checked20 Sep 2026
Where it wins
- Free reporting for traffic, complaints, filtering, and IP status
- CSV export plus automated data access for systems
- Includes malware, virus, and open-proxy indicators
Where it doesn't
- Focused on Outlook.com-specific deliverability signals
- Does not provide inbox placement monitoring
- Requires authorization for the relevant IP range or ASN
Our verdict on Microsoft SNDS
Microsoft SNDS is a free web service for email senders, internet service providers, and network administrators who control email-sending IP ranges. It focuses on Microsoft-specific diagnostics, showing IP-level email traffic and message-recipient reporting, sender complaint rates, aggregate Outlook.com spam-filter results, and status indicators for blocked, bot, or junked IPs. Access is web-based and requires Microsoft account authentication, along with authorization for the relevant IP range or ASN.
Its strongest fit is for teams that need a focused view of how Outlook.com evaluates sending infrastructure. The service also incorporates Junk Email Reporting Program feedback and displays virus, malware-hosting, and open-proxy detection indicators. CSV export supports reporting workflows, while automated data access can connect the service's information to internal systems. These capabilities make SNDS useful for diagnosing Microsoft-specific reputation concerns without a paid plan.
SNDS is narrower than a full email deliverability monitoring suite. It provides sender reputation and blocklist monitoring, but not inbox placement monitoring or spam-trap monitoring. The published service details also center the experience on Outlook.com data rather than broad mailbox-provider coverage. Choose Microsoft SNDS when free IP-level traffic, complaint, filtering, and security indicators are the priority. An alternative is more suitable when the requirement is cross-provider inbox placement analysis or broader authentication and deliverability monitoring.
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Microsoft SNDS pricing
Microsoft SNDS fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Inbox placement monitoring | No |
| Sender reputation monitoring | Yes |
| Authentication monitoring | Not verified |
| Blocklist monitoring | Yes |
| Spam trap monitoring | No |
| API access | Yes |
| Deployment | Cloud |
| Platforms | Web |
| Support | Email, Tickets, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | substrate.office.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Microsoft SNDS
- TrueSendTrueSend combines campaign operations with inbox placement, reputation, and authentication controls.9.4
- Validity EngageA broad enterprise suite for monitoring inbox placement, reputation, authentication, and spam-trap risk.9.2
- GlockAppsA focused toolkit for testing inbox placement, authentication, reputation, and spam risk.9.0
See all Microsoft SNDS alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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