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Microsoft SNDS substrate.office.com ↗

Microsoft's Smart Network Data Services portal for registering and monitoring sending IPs.

ServiceNetworkingemaildeliverabilitymicrosoft

Screenshot of substrate.office.com, Microsoft SNDS's site

Captured 9 Nov 2026

Recommended in 1 thread

Outlook.com is rejecting email from domains without DMARC
mailroute.net · 5 days ago
Lets self-hosters authorize their mail server IPs to reach Outlook.

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Link from a commenter, not checked or endorsed by us: ↗ https://substrate.office.com/ip-domain-management-snds/snds