Re: [EAI] Add requirement for punycode conversions in downgrade

[Harald Tveit Alvestrand <harald at alvestrand.no>]

Ernie Dainow skrev:
>
> If Downgrade fails when sending to a recipient of the form 
> ascii at non-ascii , what is the recourse for the user? A very few IDNA 
> literate users might figure out how to do a punycode conversion and 
> use it as an Alternate Address. Most users would have to revert to 
> using a traditional email client. 
Well, there are some possibilities for why we get that situation:

- User (or admin) has forgotten to set the Alternate Address 
(misconfiguration). Is it better for a mid-net relay to pass the message 
or to report to the sender that there's a misconfiguratoin?

- User (or admin) has decided that he doesn't care whether or not 
messages get to non-UTF8SMTP users. Is it better for a mid-net relay to 
pass the message or to report to the sender that his wishes have been 
"honored"?

- User (or admin) expected this message to go to only UTF8SMTP users. Is 
it better for a mid-net relay to pass the message or to report to the 
sender that his expectation was unrealistic?

Note: I don't know whether the answers are one or the other. But I can 
see arguments on both sides of the issue - "pass the message" is not 
necessarily always the right choice.

              Harald

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