Internationalized Email Addresses, for example প্রোটন@তৌহিদুর.বাংলা is not supported by Proton Mail. When I type my email address in Proton Mail, it weirdly tells me address is not valid.
Note that popular email service providers such as Gmail supports this.
To Reproduce:
Try to send an email to the email address given above.
Isn’t there some Russian character or something that looks exactly like and a or o but is completely different to machines
I’m sure there’s more but that’s one example I vaguely remember that’s probably incorrect
ΑΒΕΖΗΙΚΜΝΟΡΤΥΧ
Part of the capital Greek alphabet.