Microsoft SNDS: Learn How to Improve Outlook Email Deliverability

Microsoft Smart Network Data Services (SNDS) is a free Microsoft tool for monitoring the IP reputation and email performance of messages sent to Outlook and Hotmail users, though it excludes Microsoft 365 business, Office 365, and Entra B2B traffic. It reports IP activity, sending volume, recipient counts, spam-filter results, complaint rates, spam-trap hits, sample messages, HELO/EHLO identifiers, and certain abuse-related comments, helping senders identify delivery rejections, outdated lists, potential namespace farming, and reputation problems. Setup requires a Microsoft account, the relevant sending IPv4 address or range, and access to the WHOIS-listed contact email used to verify ownership. The guide recommends regularly reviewing SNDS data, exporting it through CSV or using its API, maintaining authenticated sending configurations, validating lists, using opt-in contacts, reducing spam-like content and excessive frequency, re-engaging or removing inactive subscribers, and pausing campaigns to investigate significant warning signals or complaint spikes. It also notes that high-volume Outlook senders face updated requirements focused largely on authentication and suggests combining SNDS with Google Postmaster Tools for broader deliverability monitoring.

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