Verify yahoo.com addresses

How Kavik verifies Yahoo addresses: the account-creation validation endpoint with browser-accurate TLS, not a raw SMTP guess.

Yahoo answers SMTP probes unreliably and rate-limits aggressively. Kavik verifies Yahoo addresses through Yahoo’s own account-creation validation endpoint instead, the same check Yahoo runs when a user tries to register a name.

How Kavik verifies Yahoo

  • Verification goes through Yahoo’s account-creation validation endpoint, which returns a definitive exists / does-not-exist answer for the local part.
  • Requests carry a browser-accurate TLS fingerprint and session handling, because Yahoo blocks datacenter-shaped clients with 429s regardless of rate.
  • The endpoint Yahoo moved to in mid-2026 is the one Kavik uses; raw SMTP results are treated as supporting evidence only.

What the verdicts mean here

  • Valid: the validation endpoint confirmed the account exists.
  • Risky: conflicting evidence between endpoint and SMTP.
  • Invalid: the endpoint says the name cannot exist.
  • Unknown: Yahoo throttled the check; never billed, re-check later.
curl "https://api.kavik.email/api/v1/verify?email=jane@yahoo.com" \
  -H "X-API-Key: eva_your_key"

See single verification for the full response shape.