In article <CADqLbzLO1nMks5Bz=twr1F=LjPLvuvZdhLRFjsg8aGfRojjzbA@mail.gmail.com> you write:
Well, there is a contradiction between the standards and UX.
If that is so, the UX is wrong.
User should be able to see the domain name and hardly can distinguish 'xn--foo' and 'xn--bar' values. So I strongly prefer to show both variants for IDN names.
In a proper EAI message, the IDNs in the addresses are U-labels. The only time you should see an A-label is in an ASCII message with an address like abcd@xn--efgh If mail programs are sending EAI mail with A-labels, that's something to fix at the sending end, not try to patch up at the received end. My guess is that the people maintaining Roundcube don't understand the difference between EAI mail and ASCII mail with A-label IDNs and it's a bug. R's, John