Stop man-in-the-middle downgrade attacks (RFC 8461). SentraDMARC provides a stateless, high-availability policy server with sub-5ms resolution, eliminating the complexity of manual HTTPS policy hosting and certificate rotation.
// DNS Configuration
Mandatory Encryption for Email
Traditional email encryption is opportunistic—attackers can downgrade it to plain text. MTA-STS stops this by forcing encrypted connections.
Tell external mail servers that you strictly require encryption. If they can't encrypt, they shouldn't send.
Stop man-in-the-middle attacks where hackers strip encryption from email traffic.
We host the required HTTPS policy file for you, so you don't need to manage a separate web server.
The "Man-in-the-Middle" Trap
SMTP was never built for security. See how SentraDMARC seals the gap between your servers.
Step 01: The Trigger
A bank sends a sensitive password reset. The mail travels over standard SMTP, assuming your identity is correct.
Step 02: The Attack
A hacker intercepts the DNS request and points your mail server to hacker-server.com.
Outcome: Without enforced verification, the bank hands your secrets directly to the thief.
Enforced Policy
SentraDMARC serves your authorized MX patterns at the edge. Senders verify who you are before delivery.
The sender recognizes the trap and halts delivery, preserving 100% confidentiality.