It sounds like you need to add the root and/or intermediate CA certificate(s) to your trusted certificates in your Viya Deployment. This is described here:
Are you talking about when configuring the mail service? I'm not familiar with DLP in an email context, but when configuring the mail service under custom properties you can specify property/value pairs. The property "mail.smtp.starttls.enable" with the value "true" should engage STARTTLS.
It sounds like you need to add the root and/or intermediate CA certificate(s) to your trusted certificates in your Viya Deployment. This is described here:
-- Greg Wootton | Principal Systems Technical Support Engineer
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