Developer tool lets CI pipelines auto-test email authentication before deployment

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A developer has built a free tool called Email Spam Tester that checks email deliverability — including SPF, DKIM, DMARC, blocklists, and spam engine results — without requiring an account or API key. The tool was created after a transactional email silently failed DMARC alignment following a relay migration, going undetected for nine days despite a 99% delivery rate in the dashboard. It works by issuing a disposable inbox address, accepting one test message via SMTP, and returning a detailed report covering 41 checks tied to RFC standards. The entire workflow requires only three HTTP calls and one SMTP session, making it straightforward to integrate into CI/CD pipelines. The goal is to catch authentication and DNS-level failures at the point of infrastructure change, rather than discovering them after emails begin landing in spam.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

How stateful replay ledgers make x402 payment gates secure against reuse attacks

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