enable_mta_sts

enable_mta_sts — specify whether Momentum should apply MTA-STS policies for outbound emails.

enable_mta_sts = "true|false"

This option is only effective when use_mta_sts is true for a recipient domain. This option specifies whether Momentum should try to apply the retrieved MTA-STS policy when sending emails to a remote site. See MTA-STS support in Momentum for more details.

When this option is true, the MTA-STS policy mode will be considered along with the configuration values for TLS and TLS_Verify. The more strict policy will apply:

• When the MTA-STS policy mode is enforce, regardless of the values for TLS and TLS_Verify, Momentum will enforce TLS (equivalent to TLS = required) and will fail the delivery upon a failed certificate validation (equivalent to TLS_Verify = host).
• When the MTA-STS policy mode is testing, Momentum will apply TLS = ifavailable (unless TLS = required is specified) and TLS_Verify = optional (unless TLS_Verify = host is specified).
• When the MTA-STS policy mode is none, the policy will be ignored and the configuration values for TLS and TLS_Verify will be respected.

The default value is true when use_mta_sts is true for a domain.

enable_mta_sts is valid in the domain, binding, binding_group, and global scopes.