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.
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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