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Notes from the people building Inbox OSS

Engineering, deliverability, marketing, customer stories. No fluff.

Engineering · Featured

Why we built a 7-check email validation engine (and what the 4 others got wrong)

Most validation tools stop at SMTP probe. We added catch-all detection, risk databases, MX blacklist checks, and WHOIS domain age — here's the data on why each one matters.

Danish Khan · May 5, 2026 · 12 min read

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