How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ?

Ben Stover via dev <[email protected]>
Newsgroups gmane.comp.security.nmap.devel
Message-ID <[email protected]> 
Assume a (remote) smtp mailserver smtp.foobar.com listens either on port 465 or port 587.

How can I find out (with nmap/netcat) if this smtp mailserver supports STARTTLS protocol or (only) SSL/TLS?

Or both ?

Thank you
Ben








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