MTA-STS Policy
Mail Transfer Agent Strict Transport Security
What is MTA-STS?
MTA-STS (Mail Transfer Agent Strict Transport Security) is a security standard that enables mail service providers to declare their ability to receive secure email connections and to specify whether sending SMTP servers should refuse to deliver messages if a secure connection cannot be established.
Security Features
- Encryption — Ensures email is transmitted over encrypted TLS connections
- Authentication — Validates server certificates to prevent man-in-the-middle attacks
- Policy Enforcement — Enforces security requirements for email delivery
- DANE Alternative — Provides security benefits without requiring DNSSEC
Policy Information
Status
Active
Mode
Enforce
Protocol
TLS 1.2+
Technical Implementation
This domain implements MTA-STS according to RFC 8461. The policy file is served via HTTPS and specifies the mail servers authorized to receive email for this domain.