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MXToolbox Blacklist Check vs Sender Score: catalog facts
MXToolbox Blacklist Check	Sender Score
Free The blacklist check is free to use on the website.	Free The score lookup and related tools are offered free by Validity.
Web	Web
Checks over 100 DNSBLs in one pass Accepts an IP address or a domain	Quick reputation score for an IP address or domain Return Path Blocklist lookup and removal request in one place
Covers fewer lists than some dedicated multi-RBL tools Shows listings but does not remove them	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
Not stated if an account is 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.