ietf-smtp
[Top] [All Lists]

Re: [ietf-smtp] Fwd: New Version Notification for draft-crocker-email-deliveredto-00.txt

2021-02-05 13:34:23
On Fri 05/Feb/2021 15:53:16 +0100 Dave Crocker wrote:
On 2/5/2021 2:56 AM, Alessandro Vesely wrote:

3) IDNs:

When I write a message to user@foà.it (fake user, real domain) the MDA writes
Delivered-To: user(_at_)xn--fo-kia(_dot_)it.  I see no reason for doing so.  The message is SMTPUTF8 anyway because of the To: user@foà.it header field, which is maintained.  Are there reasons to mangle the domain name?

I'd guess that has more to do with software implementation that document specification, but if there's a change to this spec you have in mind, please offer it.


Meanwhile, I had asked the same question to the developer. Here's what he answered:

    Until mail client are dominantly Unicode, one still needs to make allowance
    for ASCII mail clients that might balk on seeing 8-bit mail headers, hence
    the headers Courier adds will have UTF-8 domains translated to their ACE
    equivalents.

    Courier should accept UTF-8 userids. Can't do anything about that, so
    they'll still show up as UTF-8 in headers. This will require the IMAP or
    the POP3 client to enable Unicode support, else they'll get that warning.

I don't think that that text should go in the I-D. However, if you can extract a savvy principle from it, it may be worth to add it to the spec...


Best
Ale
--

















_______________________________________________
ietf-smtp mailing list
ietf-smtp(_at_)ietf(_dot_)org
https://www.ietf.org/mailman/listinfo/ietf-smtp