How do MTA-STS and TLS-RPT work together?

Here's the deal: You've got two tools that were built to work as a pair. MTA-STS is the enforcer. It publishes a policy file that tells other mail servers "always use TLS when sending to us." The moment they connect, they check your policy and lock in the encrypted channel. No TLS? Connection blocked. That's your protection.

But here's the problem: if something breaks on the receiving end (a bad certificate, a network hiccup), MTA-STS just silently fails the connection. You don't know it happened. That's where TLS-RPT comes in. It's the reporting system. When a TLS connection fails, the sending server generates a report and sends it to your TLS-RPT mailbox. You get detailed insight into what went wrong (certificate mismatch, DNS issues, whatever).

So the workflow goes like this: MTA-STS enforces encryption, TLS-RPT watches the traffic, and when something goes sideways, you get a report in your inbox. Deploy them together, and you've got both enforcement and visibility. Start by checking your MTA-STS policy to make sure it's correct, then set up TLS-RPT monitoring.