Creating an MTA-STS policy involves a few essential steps:
Publish a Policy: You'll need to create a policy file and host it on a specific URL (e.g., https://mta-sts.example.com/.well-known/mta-sts.txt). This file defines the rules for how email should be securely transmitted to your domain. DNS TXT Record: Add a DNS TXT record to your domain to indicate the presence of your MTA-STS policy. This record will point email servers to the location of your policy file. Configure Your Mail Servers: Ensure that your mail servers are configured to use TLS. This might involve updating your mail server software or settings to enforce TLS for incoming and outgoing emails.