ListCheckup

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ListCheckup checks whether the addresses on a mailing list can actually receive email, before you send to them. Upload a CSV or call the API, and every address comes back as Valid, Invalid, Catch-all, Risky or Unknown, each with a confidence score and a plain-English reason. Catch-all and Unknown results are never charged for: the credit is returned rather than billed as a guess. Duplicates and rows that are not email addresses are never charged either. Credits are bought once and never expire. There is no subscription. The first 100 verifications every month are free with no card. Checks run on servers in the European Union, with a data processing agreement on request. Includes bulk CSV upload, REST API, webhooks, an MCP server, team seats and PDF verification reports.