The protocol directive determines what Stunnel does during the connection setup. "protocol = smtp" tells Stunnel to use STARTTLS semantics for the connection to the server, as described in RFC2487 (similarly to how "protocol = imap" tells it to use STARTTLS for IMAP, per RFC 2595). -----Original Message----- From: Ben Stover [mailto:bxstover@yahoo.co.uk] Sent: Wednesday, October 16, 2013 11:08 AM To: Stunnel Users Cc: Bucci, David G Subject: RE: EXTERNAL: How to setup stunnel für SMTP over STARTTL S (and not pure SSL)? Sorry, I went to the webpage with the link you mentioned. There I searched for STARTTLS but NO (!) occurence was found. What does protocol (here = smtp) to do with the security handshare type (here = STARTTLS). On Wed, 16 Oct 2013 13:10:29 +0000, Bucci, David G wrote:

Oh, meant to add - look at the "protocol" option, documented here: http://www.stunnel.org/static/stunnel.html

-----Original Message----- From: Bucci, David G Sent: Wednesday, October 16, 2013 8:54 AM To: 'Ben Stover'; Stunnel Users Subject: RE: EXTERNAL: How to setup stunnel für SMTP over STARTTLS (and not pure SSL)?

https://www.stunnel.org/pipermail/stunnel-users/2011-April/003060.html

Yes, it's supported. (you'll get a cert error on that connect, ironically)

-----Original Message----- From: stunnel-users [mailto:stunnel-users-bounces@stunnel.org] On Behalf Of Ben Stover Sent: Wednesday, October 16, 2013 5:56 AM To: Stunnel Users Subject: EXTERNAL: How to setup stunnel für SMTP over STARTTLS (and not pure SSL)?

Assume my mailbox provider offers only SMTP delivery over STARTTLS (and not pure SSL).

How do I have configure stunnel to cope with this protocol?

Lets say the remote smtp server would be

smtp.foobar.com:587

How would a service section in conf file look like?

Thank you Ben

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