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Google Postmaster Tools vs Sender Score: catalog facts
Google Postmaster Tools	Sender Score
Free Free to use with a Google account.	Free The score lookup and related tools are offered free by Validity.
Web	Web
Shows how Gmail rates your sending domain Free to use	Quick reputation score for an IP address or domain Return Path Blocklist lookup and removal request in one place
Requires a Google account Only covers delivery to Gmail	Site also promotes Validity's paid email services Score reflects Validity's own data rather than every mailbox provider
Web application	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 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.