SNDS

SNDS is a reputation monitoring portal provided by Microsoft to help senders track their IP health on Outlook.com and Hotmail.

Also known as Smart Network Data Services

Smart Network Data Services (SNDS) is Microsoft's equivalent of Google Postmaster Tools. It provides data on how Microsoft views your sending IP's reputation.

Through SNDS, you can see the volume of mail you sent to Microsoft accounts, how many spam complaints (Junk Mail Reporting Program) you received, and whether your IP is currently blocked (red status) or throttled (yellow status).

If you are having trouble delivering to Outlook, Hotmail, or Live.com addresses, checking your IP status in SNDS is the first troubleshooting step.

Related terms

ReputationSender reputation is the trust score mailbox providers give your emails based on how you send and how people react. It helps decide if your messages land in the inbox or get pushed to spam.
Domain ReputationHow trusted your sending domain is by email providers like Gmail and Outlook. A strong domain reputation keeps your emails in the inbox instead of spam.
Google Postmaster ToolsGoogle Postmaster Tools is a free dashboard provided by Gmail that shows senders data about their domain reputation, spam rate, and authentication.
Dedicated IPAn IP address used only by your business to send email. It helps higher volume senders control their own reputation instead of sharing it with others.

Articles about SNDS

August 2, 2026ISP deliverability guide: Outlook and HotmailTroubleshoot Outlook deliverability when Hotmail and Outlook.com junk your mail. Use SNDS, JMRP, SRD junk votes, and the right Microsoft unblock path.
March 17, 2026How to Check Your Domain Reputation: Email Deliverability GuideLearn how to check your domain reputation for email deliverability. Understand reputation monitoring tools, factors that affect reputation, and how to improve it.
November 7, 2025Why Are My Emails Going to Spam?Learn why your emails are going to spam and how to fix inbox placement. Understand spam filters, reputation issues, and deliverability best practices.
View all articles →

More references.

SMTP field manual.

Every SMTP reply code, with real bounces from mailbox providers and spam filters and who needs to act.

Bounce playbooks.

Step-by-step fixes for bounces from Gmail, Yahoo, Outlook, Apple, and more, plus what each provider expects from senders.

Get more of your email into the inbox.

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