diff --git a/README.md b/README.md
index f6079bc..3200e73 100644
--- a/README.md
+++ b/README.md
@@ -165,6 +165,9 @@ For SEO masters, maybe those amount of website traffic is too ordinary. However,
 [GEO/AEO Tracker](https://github.com/danishashko/geo-aeo-tracker)
 > Open-source, local-first AI search visibility dashboard. Track brand mentions across ChatGPT, Perplexity, Gemini, Copilot, Google AI Overview, and Grok. BYOK, self-hosted, $0/month, with visibility scoring, citation analysis, and competitor battlecards.
 
+[MiN8T Domain Health Check](https://min8t.com/free-tools/domain-health-check)
+> Free domain auth audit covering SPF, DKIM, DMARC, MTA-STS, BIMI, and TLS-RPT in one report. Surfaces DNS issues that affect both deliverability and search-trust signals.
+
 ## Chrome Plugins
 
 [SimilarWeb](https://chrome.google.com/webstore/detail/similarweb-traffic-rank-w/hoklmmgfnpapgjgcpechhaamimifchmp)