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.
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Maker
📌
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 🙏