BillionVerify
Email verification with real-time SMTP checks and bulk cleaning
About BillionVerify
BillionVerify is an email verification tool for marketers, sales teams, and developers who need to know whether an address can receive mail before they send to it. Single addresses can be checked in a browser, CSV or XLSX lists can be uploaded for bulk cleaning, and an API handles checks inside sign-up forms, CRMs, and automations.
Each address passes through syntax, domain and MX lookups, a live SMTP mailbox check that sends no message, and risk signals for catch-all, disposable, and role addresses. Results come back as valid, invalid, catch-all, disposable, role, or unknown, with a reason code explaining each status.
The product also offers an MCP server and agent skills so AI assistants can verify addresses from a plain request. Free daily credits are available on signed-in accounts, and a white-label option lets agencies offer the verifier under their own brand.
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