ZeroBounce
Email validation and deliverability API that verifies email addresses in real-time or in batch, scoring them on validity, bounce risk, spam traps, and abuse patterns.
Best When
You need high-accuracy email validation with detailed scoring (bounce type classification, spam trap detection) and want a well-documented API with SDKs in multiple languages.
Avoid When
You only need basic syntax validation (do that client-side for free) or you're looking for a free email validation service at scale.
Use Cases
- • Real-time email validation at form submission to prevent bad emails entering your database
- • Batch validation of email lists before sending marketing campaigns
- • Scoring email quality to identify temporary/disposable addresses
- • Abuse and spam trap detection to protect sender reputation
- • Email append — finding email addresses for known contacts
Not For
- • Email sending — this is validation only, not an ESP
- • SMTP testing or email deliverability testing beyond validation
- • Domain-level DNS checks without email-level verification
Alternatives
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Scores are editorial opinions as of 2026-03-01.