It appears that Danjel Jungersen via Postfix-users <[email protected]> said:
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>Hi.
>
>We have strange letters here. (æøåÆØÅ).

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

>3E0D010E0084: to=<stefan@vestskovsløbet.dk>, 
>relay=mx.simply.com[94.231.106.20]:25, delay=0.88, 
>delays=0.46/0.1/0.32/0, dsn=5.6.7, status=bounced (SMTPUTF8 is required, 
>but was not offered by host mx.simply.com[94.231.106.20])

His correspondent's mail is misconfigured.  If a mail server is going to
handle mail with IDN addresses, it needs to enable the SMTPUTF8 feature
which his provider mx.simply.com has not done.  That is their mistake,
they have to fix it.

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.

R's,
John
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