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Microsoft SNDS vs Google Postmaster Tools: catalog facts
Microsoft SNDS	Google Postmaster Tools
Free Free for senders who register their networks.	Free Free to use with a Google account.
Web	Web
Reputation data directly from Outlook.com Junk email feedback loop in the same portal	Shows how Gmail rates your sending domain Free to use
Requires login and verified control of the IP ranges Access expires and must be reattested periodically	Requires a Google account Only covers delivery to Gmail
Hosted service	Web application
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 24, 2026	Official website Full listing and sources Checked September 23, 2026

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