Abstract API
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Abstract API's email validation service runs comprehensive checks: SMTP verification to confirm mailbox existence, MX record validation, syntax parsing, and identification of disposable providers and catch-all addresses. The API is straightforward to integrate and works with most programming languages.
The free tier makes it accessible for teams testing out their validation workflow. Paid plans scale affordably, and the service's reliability and speed make it a practical choice for both small operations and growing lists.