Our MTA-STS Lookup Tool is a free online service that allows users to check and analyze Mail Transfer Agent Strict Transport Security (MTA-STS) records for any domain. MTA-STS is an important email security protocol that enhances the security of SMTP connections between sending and receiving mail servers by enforcing the use of encrypted communication channels. This helps protect emails from being intercepted, altered, or spoofed during transit, thereby improving the overall security of email communications.
Key Features of the MTA-STS Lookup Tool:
- MTA-STS TXT Record Verification: The tool identifies and displays the MTA-STS TXT record for the domain, which contains critical information such as the protocol version and policy ID. This record confirms that the domain is set up to use MTA-STS and provides the version information, ensuring compatibility with the MTA-STS protocol.
- Policy File Analysis: The tool retrieves and examines the MTA-STS policy file from the domain’s server. This file outlines the specific rules that sending servers must follow when communicating with the domain. Key elements of the policy file include:
- Version: Specifies the MTA-STS version used, typically ‘STSv1’, ensuring the policy conforms to the latest standards.
- Mode: Indicates the enforcement level of the policy, which can be set to ‘none’, ‘testing’, or ‘enforce’:
- None: The policy is published, but not enforced.
- Testing: The policy is tested without being strictly enforced, allowing domain owners to monitor how it would perform.
- Enforce: The policy is actively enforced, requiring encrypted connections.
- Mail Exchange (MX) Records: The tool displays the list of authorized mail servers (MX records) specified in the policy file. This ensures that only these servers are recognized as legitimate for sending emails on behalf of the domain.
- Maximum Age (max_age): It checks the ‘max_age’ value, which defines how long the policy should be cached by other servers. A typical value is in seconds (e.g., 86400 seconds), determining how often servers need to check for updates to the policy.
By using our MTA-STS Lookup Tool, users can verify the implementation and correctness of their MTA-STS policies, gain insights into their domain’s email security posture, and take necessary steps to ensure secure email communication. This tool is essential for organizations looking to enhance their email security and protect their domains from potential email-based threats.
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DMARC Report is designed for large scale reporting needs, with a combination of domains and message volume.
