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: [email protected] 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, <[email protected]> wrote: > P.s. > > From: "Phil Smith III" <[email protected]> > 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. > > -- > > 123456789 123456789 123456789 123456789 123456789 123456789 123456789 > Tel: +1 360 639 0202 Pender Is.: +1 250 629 3757 > http://easthope.ca/Peter.html Bcc: peter at easthope. ca > > _______________________________________________ > stunnel-users mailing list > [email protected] > https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users >
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