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Sender Score vs Google Postmaster Tools: catalog facts
Sender Score	Google Postmaster Tools
Free The score lookup and related tools are offered free by Validity.	Free Free to use with a Google account.
Web	Web
Quick reputation score for an IP address or domain Return Path Blocklist lookup and removal request in one place	Shows how Gmail rates your sending domain Free to use
Site also promotes Validity's paid email services Score reflects Validity's own data rather than every mailbox provider	Requires a Google account Only covers delivery to Gmail
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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.