[nebul]

In my experience Punycode support in browsers varies greatly depending on the phishing[1] mitigations in place, making them quite unreliable in practice unfortunately.

I'm pleasantly surprised about SMTPUTF8 being a thing though. Yeah nobody uses it, but I thought email had zero UTF-8 support so it's at least better than nothing, I guess.

[1] https://en.wikipedia.org/wiki/IDN_homograph_attack#Homograph...

[GoblinSlayer]

SMTPUTF8 is about unicode email addresses. I think, UTF-8 messages have wide support.

[nebul]

Sorry, I was indeed talking about Unicode email addresses but I worded it poorly. Thanks for the precision!