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46 lines
1.1 KiB
Markdown
46 lines
1.1 KiB
Markdown
# Example: `mta-sts.txt`
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This is an example of an **MTA-STS policy file** with all possible values.
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Save this file as `.well-known/mta-sts.txt` and serve it over HTTPS at:
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`https://mta-sts.example/.well-known/mta-sts.txt`
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---
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## Policy Fields
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```plaintext
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version: STSv1
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# The version of the MTA-STS policy. Must be "STSv1".
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mode: enforce
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# The policy mode. Possible values:
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# enforce - SMTP servers must enforce the policy.
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# testing - Policy is in testing; violations are reported but not enforced.
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# none - No policy is applied.
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mx: mail.example.com
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mx: *.mail.example.net
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# The list of MX patterns (hostnames) that are valid for your domain.
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# Wildcards (*) are allowed only as the left-most label.
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max_age: 86400
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# The time (in seconds) that the policy is valid for.
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# Recommended minimum is 86400 (1 day). Maximum is 31557600 (1 year).
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```
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---
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## Example Full Policy
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```plaintext
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version: STSv1
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mode: enforce
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mx: mail.example.com
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mx: *.mail.example.net
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max_age: 86400
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```
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---
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For more details, see:
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[RFC 8461 - MTA-STS Specification](https://datatracker.ietf.org/doc/html/rfc8461) |