Free email testing tool with AI-powered deliverability scoring. Test spam scores with SpamAssassin, check WCAG accessibility, and verify compatibility across Gmail, Outlook, Apple Mail & 15+ clients. GPT-4o & Claude analyze all results into prioritized fixes. One Docker command setup.

I built MailLinter because email testing in dev environments is still way more painful than it should be. MailLinter is a self-hosted MailHog-style SMTP trap, but with an opinionated twist: 📮 Local SMTP server to catch emails (no accidental sends) 🖥️ Clean inbox UI to inspect headers, HTML, and text 🤖 Optional AI-powered analysis (spam signals, accessibility, clarity) 🐳 Runs with a single Docker command 🔑 You bring your own OpenAI key — everything stays local It’s designed for developers who want confidence before production, not another SaaS inbox. I’d genuinely love feedback on: DX: setup, defaults, and local dev workflow Whether the AI feedback is actually useful vs. noisy Missing features that would make this a “must-have” in your stack Happy to answer any technical questions, and thanks for taking a look 🙏

Hey, following up on Maillinter.

Email quality tools usually sell best when the outcome is unmistakable: fewer bounces, better inbox placement, more revenue per send.

Your tool does the hard part, the page just needs to connect those dots faster for the buyer.

If you want help translating the technical strength into business impact, let me know.

Paul