The default behavior of any listener for TLS communication is B. off. This means that TLS is not allowed for incoming connections to the listener and connection s to the listener do not require encrypted Simple Mail Transfer Protocol (SMTP) conversations. This is stated in the web search result 1 . To enable TLS for a listener, you need to configure the Use TLS option in the mail flow policy settings for the listener on the Mail P olicies > HAT Overview page 1 . You can choose from three different settings for TLS: No, Preferred, or Required 1 .
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