Nmap Development mailing list archives

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

From: Ben Stover via dev <dev () nmap org>
Date: Sat, 21 Oct 2017 08:17:06 +0200

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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Current thread:

How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ? Ben Stover via dev (Oct 20)
- Re: How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ? Jasey DePriest (Oct 21)
  - Re: How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ? Watson, Patrick (Oct 23)
- Re: How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ? Dave Horsfall (Oct 29)
- <Possible follow-ups>
- Re: How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ? Ben Stover via dev (Oct 25)
  - Re: How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ? Watson, Patrick (Oct 26)
    - Re: How to find out if SMTP mailserver supports STARTTLS or (only) SSL/TLS ? Jasey DePriest (Oct 26)