How do I implement MTA-STS?
You must:
Configure server side TLS by ensuring all your inbound mail servers listed in your MX records already support TLS 1.2 or higher with a valid trusted certificate.
- Create the HTTPS endpoint.
- Publish the policy file.
- Add the DNS TXT record.
- Set the mode to testing first.
- Monitor TLS reports.
- Then move to enforce.
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