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Microsoft SNDS vs Sender Score: catalog facts
Microsoft SNDS	Sender Score
Free Free for senders who register their networks.	Free The score lookup and related tools are offered free by Validity.
Web	Web
Reputation data directly from Outlook.com Junk email feedback loop in the same portal	Quick reputation score for an IP address or domain Return Path Blocklist lookup and removal request in one place
Requires login and verified control of the IP ranges Access expires and must be reattested periodically	Site also promotes Validity's paid email services Score reflects Validity's own data rather than every mailbox provider
Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.