On 03-07-2026 03:04, John R. Levine wrote:
On Thu, 2 Jul 2026, Danjel Jungersen wrote:
That's an Internationalized Domain Name (IDN), in the Unicode
U-label form.
THe encoded A-label equivalent which you can look up in the DNS is
xn--vestskovslbet-knb.dk
...
A possible workaround is to send mail to the A-label version of the
address, [email protected] which would not need SMTPUTF8.
I poked at the server and it accepted that address.
Is there a reason why this is not attempted automatically?
Postfix considers the A-label and U-label versions of the address to
be distinct. Wietse might tell us what the thinking was.
The receiver claims that he receives mail from other people using the
IDN version.
Honestly, I'm sceptical. My guess is that the other people have the
A-label version of the address in their address book, and his mail
program doesn't show him the address in incoming mail.
Thank you all for your time.
Just a little update.
The receiver still claims "that it works".
But the receiver is a volunteer in a project / event.
The project is now cancelled, they did not get enough responses for
extra hands to help with the event.
So maybe I'm just the only one asking questions...
JM2C
Danjel
I have done a lot of EAI related work for ICANN and I can tell you
that using IDN mail addresses is one of those things that is supposed
to work but is painful in practice. A lot of software almost but not
quite implements it, as we saw here. Postfix support is fine (one of
the things I did was to test it and it got a gold star) but you have
to turn it on.
R's,
John
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