Microsoft SNDS
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Microsoft's Smart Network Data Service (SNDS) gives you direct visibility into how Outlook and Hotmail systems perceive your sender reputation. It shows your IP status, bounce rates, complaint rates, and whether you're flagged in Microsoft's throttling or blocking systems. This data comes straight from the mailbox provider responsible for Outlook, Hotmail, and Office 365, making it the authoritative source for Microsoft-bound email health.
Essential for anyone sending significant volume to Microsoft inboxes. Unlike third-party reputation monitoring services, SNDS shows you what Microsoft's own systems are tracking, so you catch problems before they tank your deliverability to one of the largest mailbox providers.