The MTA-STS Checker is a tool designed to verify the presence and correctness of MTA-STS DNS records and policy files for a domain. It ensures that the records are properly published and configured according to the specification, enhancing email security by enforcing encryption and preventing man-in-the-middle attacks.

Key Features

• MTA-STS Record Validation: Checks if the MTA-STS TXT record is correctly published in DNS.
• Policy File Verification: Confirms if the MTA-STS policy file is accessible at the specified URL and validates its content.
• Syntax and Specification Compliance: Ensures that the MTA-STS record syntax aligns with the standard specification.
• Configuration Suggestions: Provides recommendations for setting up MTA-STS correctly.

Benefits

• Improved Email Security: Enhances confidentiality by ensuring all emails sent to a domain are encrypted.
• Prevention of Attacks: Reduces the risk of man-in-the-middle attacks by enforcing strict transport security.
• Enhanced Deliverability: Helps improve email deliverability by avoiding potential security issues.