Proton Mail does not support Internationalized Email Addresses

Proton Mail is based in Switzerland and uses advanced encryption to keep your data safe. Apps available for Android, iOS, and desktop devices.

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.

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