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MultiRBL vs Sender Score: catalog facts
MultiRBL	Sender Score
Free Free to use, with optional Bitcoin donations.	Free The score lookup and related tools are offered free by Validity.
Web	Web
Checks over 200 blacklists and whitelists Supports IPv4 and IPv6	Quick reputation score for an IP address or domain Return Path Blocklist lookup and removal request in one place
No help with removal requests Plain interface with lots of technical output	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
No 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.