We have a requirement to send emails via a SMTP server which requires TLS authentication. Going through some logs we tried changing the parameter "SSLversion = TLSv1", but still getting authentication failure.

So, we would like to verify if stunnel is trying to sending request via TLS method before looking for any issues at SMTP end. Is there a way we can verify from stunnel logs if the request is sent via TLS?

Thanks & Regards,

Shanmu