MailProbe

MailProbe is a real-time email verification REST API for developers and marketers who need to clean their lists before sending campaigns or accepting new signups.

Each verification runs four sequential checks: RFC-compliant syntax validation, DNS MX lookup to confirm the domain accepts mail, a live SMTP handshake to verify the mailbox exists (no email is ever sent), and categorization across disposable providers (5,000+ domains tracked), role-based addresses, free providers (Gmail, Outlook, etc.) and catch-all configurations. Results are returned as a structured JSON response, ready to plug into your signup flow, CRM cleanup pipeline, or pre-send deliverability check.

Pricing is straightforward and positioned 3 to 4× cheaper than the established leaders: $5 for 1,000 verifications (Starter) or $20 for 10,000 (Pro). No subscription, no monthly minimum, credits never expire. New accounts get 100 free credits on signup — enough to run a real test against your actual data before paying anything.

Authentication is passwordless: a magic link is sent to your email, and the API uses a single bearer token you generate from the dashboard. The batch endpoint accepts up to 500 emails per request, with atomic credit deduction and automatic refunds on failure.

Privacy by design: MailProbe never stores or caches verification results. Your email lists are processed in-memory and immediately discarded — a deliberate engineering choice to comply with GDPR and avoid the data retention practices common in this industry.

Built and operated in France by Iris Digital. Live in production since March 2026.