[stunnel-users] Problems with stunnel and cox.net on Windows 7

Thu Jan 18 17:39:20 CET 2018

Some protocols use a protocol-specific command to begin TLS negotiation
(STARTTLS for SMTP and POP3), so stunnel needs to know how (and be told) to
use that command.

However, I believe you only need to do this if using TLS on a POP3
connection on port 110. POP3S on port 995 should implicitly use TLS.

*Andrew Culver*
System Engineer
Western Technology Services <https://wts.uwo.ca>
University of Western Ontario <https://www.uwo.ca>
e: aculver at uwo.ca
p: 519-661-2111 x80265 <15196612111,80265>
cal: html <http://goo.gl/wVoDlo> | ics <http://goo.gl/ncUjV0>

On Thu, Jan 18, 2018 at 9:51 AM, <peter at easthope.ca> wrote:

> P.s.
>
> From:   "Phil Smith III" <phs3stuff at cox.net>
> Date:   Wed, 17 Jan 2018 21:59:42 -0500
> > protocol = pop3
>
> The stunnel(8) manual has this.
> "protocol = PROTO
>     application protocol to negotiate TLS
>     This option enables initial, protocol-specific negotiation of the TLS
> encryption."
>
> Is there any need for protocol-specific negotiation?  Why?  Stunnel
> provides a tunnel and POP3 works inside.  That's all.  Try the
> configuration without the protocol option.
>
> Regards,                         ... Peter E.
>
> --
>
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> Tel: +1 360 639 0202                      Pender Is.: +1 250 629 3757
> http://easthope.ca/Peter.html              Bcc: peter at easthope. ca
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