[Oberon] Oberon and TLS; was A2.

[peter at easthope.ca]

Chris,

>From lab.eas at gmail.com  Mon Jan 18 19:08:45 2016
> Can it handle the <TLS> protocol needed for gmail;

As I understand, you intend an Oberon workstation.  Native Oberon on 
a PC or Oberon as a subsystem of another system.  You require 
non-local communication to be within TLS.  Possible with a little 
elaboration.

* PC Native Oberon

Years ago Guenter Feldmann implemented SSL for Oberon.  That might 
work for receiving mail from a smarthost.  I haven't tried.  As 
Oberon is distributed, authentication is absent    from SMTP; an 
obvious snag for sending to some smarthosts.

In addition to your workstation, set up a router system.  A Linux 
router works nicely.  It should have a firewall such as provided by 
Shorewall.  Nowadays it can be a machine fitting in the palm of 
your hand.  The Oberon workstation sends a message to the Linux 
router using port 25; no TLS.  The MTA on the router forwards the 
message under TLS.  The default MTA in Debian Linux is Exim4. It 
works here.  

For receiving mail, install stunnel on the router.  Communication 
between Oberon and the router is through port 110 without TLS.   
Between the router and smarthost TLS is provided by stunnel.  In 
the example in https://en.wikipedia.org/wiki/Stunnel substitute 
POP3 for SMTP.  

* Oberon subsystem running on another system.

This is the above arrangement running on one machine rather than 
two.  The Oberon subsystem sends messages to localhost and 
retrieves from localhost.

Regards,                ... Lyall E.

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