Email Validation And List Hygiene

via “email-verification-and-validation”

275M+ contacts database API for sales intelligence.

Unique: Combines Apollo's proprietary contact database (275M+ verified emails) with real-time SMTP validation and pattern matching to provide both database-backed verification (high confidence for known contacts) and probabilistic validation (for unknown addresses) — enabling both high-confidence verification for existing contacts and best-effort validation for new prospects

vs others: Higher accuracy for B2B work emails compared to generic email verification services (Clearbit, Hunter) because it validates against Apollo's proprietary database of 275M+ verified business contacts, reducing false positives for legitimate work email addresses