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Field notes on email verification & deliverability

Engineering deep-dives, honest takes on how verification really works, and what we learn building MailBounce. No fluff, no fabricated stats.

Why we don’t charge for “unknown” resultsTransparencyWhy we don’t charge for “unknown” resultsMost verifiers bill you per address checked, even when they can’t actually tell you anything. We think that’s backwards — here’s the rule we built instead.Jun 13, 2026 · 6 min read
How email verification actually works, step by stepEngineeringHow email verification actually works, step by stepWhat really happens between “submit” and a verdict — syntax, DNS, the live SMTP conversation, and why some addresses can never be known for sure.Jun 10, 2026 · 9 min read