Hosted MTA-STS Services Free Trial – Secure Email with TLS

Protect your emails from interception with PowerMTA-STS

Contact us How Does MTA-STS Work?

What is MTA-STS?

MTA-STS (Mail Transfer Agent Strict Transport Security) is an email security standard that enforces the use of TLS encryption during mail transfer. Without it, attackers can launch downgrade attacks or intercept unencrypted traffic between mail servers. By implementing hosted MTA-STS, organizations ensure that messages are always transmitted securely, preventing tampering and eavesdropping.

How To Use Hosted MTA-STS

The DNS Lookup Limit

PowerDMARC’s Hosted MTA-STS Services

Trust the best to fix your SPF problems!

Configuring and maintaining MTA-STS manually requires DNS changes, certificate management, and constant monitoring. PowerDMARC’s Hosted MTA-STS service simplifies this process.

  • We help you publish your DNS CNAME records with just a few clicks

  • We take the responsibility of maintaining the policy web server and hosting the certificates

  • Through our hosted MTA-STS services, deployment on your part is reduced to simply publishing a  few DNS records

  • You can make MTA-STS policy changes instantly and with ease, through the PowerDMARC dashboard, without having to manually make changes to the DNS

  • PowerDMARC’s hosted MTA-STS services are RFC compliant and support the latest TLS standards

  • From generating certificates and MTA-STS policy file to policy enforcement, we help you evade the tremendous complexities involved in adopting the protocol

The DNS Lookup Limit

Why Do You Need MTA-STS?

Email is often the target of man-in-the-middle attacks that exploit weak or downgraded encryption. Without MTA-STS, attackers can:

  • Downgrade connections from TLS to plaintext to intercept messages.
  • Spoof or tamper with SMTP sessions.
  • Target misconfigured domains for persistent monitoring.

By deploying MTA-STS with PowerDMARC, you:

  • Guarantee TLS encryption for email in transit.

  • Prevent downgrade attacks before they happen.

  • Ensure compliance with evolving security standards.

Build trust by safeguarding communications with clients, partners, and employees.

How Does MTA-STS Work?

When an email server tries to deliver a message to your domain:

  1. The sending server checks your published MTA-STS policy.

  2. It confirms that TLS must be used for delivery.

  3. If TLS cannot be negotiated, the email will not be delivered, ensuring no message is sent in plaintext.

This simple but effective mechanism makes sure that sensitive communications remain private and authentic.

One-Click Optimizer

Deploy Hosted MTA-STS at your organization fast and easy with PowerDMARC

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