Also, if you choose to use only TLS, you can specify a certificate for client authentication on the SMTP server. If you choose to use only TLS, you can specify a certificate for authentication of the SMTP server and choose whether you want to enable communication through any version of TLS or only through TLS 1.2 or later versions. You can disable usage of TLS, use TLS if the SMTP server supports this protocol or you can force usage of TLS only.
You can specify TLS settings for SMTP server: Subject name (subject name of an email message).Specify the TLS settings for SMTP server:
