Mail Transfer Agent Strict Transport Security (MTA-STS) is a mechanism that allows mail servers to declare their ability to receive secure connections.
This page is used to verify the presence of an MTA-STS policy.
For more information, visit the MTA-STS RFC.
To set up MTA-STS, create a file named .well-known/mta-sts.txt in the root of your web server with the following content:
version: STSv1 mode: enforce max_age: 604800 mx: mail.example.com
Replace mail.example.com with your mail server's domain.
Ensure that your web server is accessible over HTTPS and that the MTA-STS policy is served with the correct headers.
For more details on how to implement MTA-STS, refer to the MTA-STS RFC.
For testing purposes, you can use tools like MTA-STS Test to verify your configuration.
For further assistance, please contact your system administrator or refer to your mail server's documentation.
Thank you for using MTA-STS!