Finders: Hunter, Findymail, Apollo, Lusha. Verifiers: NeverBounce, ZeroBounce, Million Verifier. Always verify finder output before sending — finders have 70–90% accuracy; verifiers push you to 95%+.
Finder vs verifier
Finder guesses the email (pattern-based or database). Verifier checks if the inbox actually exists and accepts mail.
Workflow
Find → verify → only send to 'valid' or 'risky-but-verifiable.' Skip 'invalid' and 'catch-all' for cold.
Catch-all handling
Catch-all domains accept everything — bounces are deferred. Treat catch-all addresses as high-risk.
How SendroAI Fits In
SendroAI requires verified lists upstream; pair with your preferred verifier.