On 27 Nov 2015 2:48 PM, Viktor Dukhovni wrote:
On Fri, Nov 27, 2015 at 02:29:36PM -0500, Felipe Gasper wrote:

It appears to me that you, Jason, and I are understanding the
issue and question differently.  If Felipe still thinks there is
[
a problem, some clarification from him might help.


Yes, NDNs, of the variety that Exim sends in response to “fail text "..."”
filters, are what my inquiry concerns.

A non-delivery-notification (MIME multipart/report content type
RFC3462) consists of (up to) three parts:

     1. Required initial free-form body part, this can use UTF-8
        without any need for EAI.

     2. Required message/delivery-status machine readable part,
        this requires EAI for non-ASCII content. (RFC3464).

     3. Optional returned message or message headers.  If
        the returned message has UTF-8 headers, it may need
        to encapsulated as an EAI message/global

My interpretation of the question was that you wanted UTF-8 in the
"part 1", body, in which case *in principle* you could have raw
UTF-8 there, and a "charset=utf-8" attribute for the enclosing MIME
part, provided that the code that generates bounces (in this case
in Exim) allows you configure the charset and associated content.

Yes, part 1 is where I want the UTF-8 to go.

I’ve not consulted the RFCs myself. Basically, I want the text after Exim shows the intended recipient address to be able to be any UTF-8 characters.

-FG

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