Enterprise Email Infrastructure: Security Baseline and Best Practices - ARC SEAL

Mail Transfer Agent Strict Transport Security (MTA-STS)

MTA-STS is a security protocol that enables email service providers to ensure emails are only sent using encrypted channels, helping to prevent downgrade attacks and man-in-the-middle attacks.

Benefits:
- Enforces the use of TLS for email transmission
- Protects against man-in-the-middle attacks
- Ensures the privacy and integrity of email communications

Implementation:
1. Publish an MTA-STS policy in your DNS settings.
2. Create an MTA-STS policy file and host it on your web server.
3. Configure your mail servers to enforce the MTA-STS policy.