trashposs/docs/punycode.md

Domains containing characters beyond the ASCII range (Unicode)

To keep things simple, if it is your own domain, set the punycode equivalent in your config as a public URL.

You can use a converter like this: https://www.charset.org/punycode

If it is someone else's# domain, TrashPoss will do the conversion automagically.

Domains in user profiles get displayed as their Unicode representation, not as ASCII.