MailTest

Most tools say DKIM failed. MailTest tells you why

Open Source Email Marketing Developer Toolsローンチ 2026年4月17日

MailTest とは？

SPF ✅ DKIM ✅ DMARC ✅ — yet your emails still land in spam? Most tools just say "DKIM failed" without explaining WHY. MailTest goes deeper: 12 technical checks + actionable insights that show you exactly what's broken and how to fix it. Self-hosted, open source (after 100 users), built for developers who need real answers, not just red/green checkmarks. Try it free: 3 tests/day, no credit card.

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