MTA-STS Studio

Guides

Practical, plain-English explainers to go with the tool.

What is MTA-STS? How it stops inbound mail being downgraded to plaintext. Testing vs enforce How to roll out MTA-STS safely. How to publish MTA-STS The DNS id record, the policy file, and the HTTPS host. What is TLS-RPT? Reading the daily TLS reporting aggregates. MTA-STS vs DANE Two ways to require SMTP TLS — do you need both?