Marketing, demand and conversion · Email and landing diagnostics
checkdmarc
Licence or access: Apache-2.0
- license
- Apache-2.0
- role
- domains → SPF/DMARC/BIMI/MX/STARTTLS/DNSSEC/DANE/MTA-STS/TLS-RPT
- limitation
- DNS posture ≠ inbox placement; live SMTP checks are direct and can be blocked
- official source
- Repo
Official sources
- Repo https://github.com/domainaware/checkdmarc
Catalogued at the 2026-09-01 research baseline. Verify the licence, free-tier limits, API schema and source terms again before deployment, and record a version-pinned registry entry for whatever you select.
Source: file 07 · 7-email-and-landing-diagnostics · line 107