Glossary
Smart Network Data Services (SNDS) is a free tool provided by Microsoft that offers visibility into how Microsoft’s Outlook infrastructure views your sending IPs. SNDS gives senders access to key deliverability indicators, including:
These insights help senders understand how Microsoft evaluates their traffic and whether their emails are likely to reach the inbox – or be filtered as spam.
Monitoring SNDS is especially important for high-volume senders using dedicated IPs. It’s not real-time and doesn’t cover domain reputation, but when paired with other tools (like Google Postmaster Tools), it can help diagnose deliverability issues and protect your sender reputation.
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