version of stunnel and SMTP with STARTTLS

[dapiot holmp]

Hi

what version of stunnel is this
http://johnny.chadda.se/article/add-proper-ssltls-support-for-all-applications-using-stunnel/

I notice that webpage has stunnel using  SMTP..with STARTTLS

What command would do that with the stunnel that comes with cygwin?

Thanks

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