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Google Postmaster Tools vs Microsoft SNDS: catalog facts
Google Postmaster Tools	Microsoft SNDS
Free Free to use with a Google account.	Free Free for senders who register their networks.
Web	Web
Shows how Gmail rates your sending domain Free to use	Reputation data directly from Outlook.com Junk email feedback loop in the same portal
Requires a Google account Only covers delivery to Gmail	Requires login and verified control of the IP ranges Access expires and must be reattested periodically
Web application	Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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