WhoisXML API
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WhoisXML API's bulk email verification handles up to 50,000 addresses per batch, making it practical for cleaning large lists or validating imports. It identifies free email providers, detects disposable services, and validates mailbox existence through SMTP probes.
This is built for teams managing substantial email databases who need reliability at scale. The API delivers detailed reports showing bounce risk, provider type, and verification confidence scores for each address.