MTA-STS (Mail Transfer Agent Strict Transport Security)

At Millionaire.email, we enforce strict encrypted email delivery by implementing MTA-STS, a protocol that ensures all incoming messages are delivered only over secure, trusted TLS connections.

Our live MTA-STS policy is publicly accessible at:
🔗 mta-sts.millionaire.email/.well-known/mta-sts.txt

This policy blocks insecure fallback routes and protects against:

• 🛑 Downgrade attacks

• 🔒 TLS stripping

• 🕵️‍♂️ Man-in-the-middle interception

If a mail server tries to deliver email to us without proper TLS support, the message is rejected — not downgraded. We don’t just hope for encryption; we require it.

MTA-STS is part of our layered defense system, working in tandem with SPF, DKIM, DMARC, and TLS-RPT to ensure end-to-end trust and message delivery security.