Summary

This article guides you through troubleshooting the "MTA-STS: Not Active" error by verifying DNS entries for your MTA-STS record using recommended third-party tools.

Objective

Ensure that your MTA-STS record is correctly published in DNS to activate MTA-STS functionality.

Introduction

The "MTA-STS: Not Active" error indicates that your Mail Transfer Agent Strict Transport Security (MTA-STS) policy is not active due to incorrect or missing DNS entries. This guide helps you verify and correct your DNS configuration.

Prerequisites

  • Access to your domain's DNS management console.
  • Knowledge of your MTA-STS policy details.
  • Internet access to use third-party MTA-STS verification tools.

Step-by-Step Instructions

  1. Check your MTA-STS DNS entries:
    Use one of the following third-party tools to verify your MTA-STS record:
    https://esmtp.email/tools/mta-sts/
    https://mxtoolbox.com/mta-sts.aspx
  2. MTA-STS Not Active Error Screenshot
  3. Review the verification results:
    • Ensure that your DNS entries match the required MTA-STS configuration.
    • Correct any missing or incorrect entries in your DNS management console.

Conclusion

By verifying and correcting your DNS entries, you can resolve the "MTA-STS: Not Active" error and ensure that your MTA-STS policy is active and securing your email traffic.