Re: [ietf-smtp] Characteristics of Isolated (or mostly-isolated) industrial IP Networks

[Dave Crocker <[e-mail]>]

On 1/4/2020 8:03 PM, Keith Moore wrote:
> I suspect ietf-smtp would do better to define the behavior of a 
> submission service that is designed to accept inbound email from devices 
> in such an environment 

The clients in such an environment appear to simply be MUAs.  The 
submission server appears simply to be an MSA.

I gather what makes them distinctive is methods of identification and 
authentication -- notably reliance on network address rather than domain 
names -- rather than anything involving email semantics or basic 
protocol details (beyond ID & Auth)?

What else is distinctive?


and forward such email to a "smarthost"

What are the differences from a classic originating MTA?



 From your note, the reliance on IP Address and boundary security rather 
than encryption appear to be the primary points of distinction.

In any event, I suspect it would be helpful to create an Informational 
RFC that discusses design, administration and operations issues that are 
noteworthy in common IoT environments.  Sounds like it doesn't need to 
be lengthy of complicated, but formulating a discrete set of statements 
and getting community consensus on it could facilitate detailed wg 
decision-making, here and elsewhere.


d/
-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net