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enable_mta_sts

Since: Version 2023.11.28-b5252a41

The functionality described in this outlined box requires version 2023.11.28-b5252a41 of KumoMTA, or a more recent version.

When set to true (which is the default), the MTA-STS policy for the destination domain will be used to adjust the effective value of enable_tls.

If the policy is set to "enforce", then, assuming that the candidate MX host name matches the policy, the connection will be made with enable_tls="Required". If the host name does not match, the candidate MX host will be not be used.

If the policy is set to "testing", then the connection will be made with enable_tls="OpportunisticInsecure".

If the policy is set to "none", then your configured value for enable_tls will be used.

If enable_dane=true and TLSA records are present, then any MTA-STS policy will be ignored.