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

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

Ernie Dainow skrev:
> When sending email from an address containing an ASCII local name and a 
> non-ASCII domain to an all ASCII recipient on a non-UTF8SMTP system, a 
> downgrade should occur. Following the current EAI drafts, downgrade 
> fails if there is no Alternate Address provided for the sender. In this 
> case, an Alternate Address is not really required, as the sender's 
> address can be represented in ASCII by doing a punycode conversion on 
> the domain part of the address. There is also a similar case when the 
> recipient address is of the form ascii at utf8.domain.
>
> There are several ways to address these cases:
> 1. No change to the current drafts. It is the responsibility of the 
> sender to provide an Alternate Address if they want Downgrade to occur. 
> They can provide the punycode equivalent address as an Alternate Address.
> 2. The MUA can automatically do punycode conversions for these cases 
> when Alternate Addresses are not provided by the user.
> 3. Downgrade should do a punycode conversion instead of failing because 
> of no Alternate Address.
>
> Since attempting delivery is almost always better than failing a 
> delivery, I would support adding a requirement to do the punycode 
> conversion for these cases in the Downgrade specification.
For the case of non-ASCII localparts, this has been discussed 
extensively, and version 3 has been consistently rejected by the WG.

I haven't seen a discussion that focused on the ASCII at non-ASCII situation.

               Harald


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