vand3rlinden.com enforces MTA-STS (Mail Transfer Agent Strict Transport Security) to enhance the security of email communication by requiring SMTP connections to use TLS (Transport Layer Security).
MTA-STS policy for vand3rlinden.com: http://mta-sts.vand3rlinden.com/.well-known/mta-sts.txt.
Deployment: Host the MTA-STS Policy on Github Pages.
Repository of the MTA-STS policy for mta-sts.vand3rlinden.com: https://github.com/vand3rlinden/mta-sts.
For more information, please refer to the MTA-STS RFC8461.