gnus-use-idna

gnus-use-idna is a variable defined in `gnus-art.el'.
Its value is

nil

Documentation:
Whether IDNA decoding of headers is used when viewing messages.
This requires GNU Libidn, and by default only enabled if it is found.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.