Because local part can be mix of ascii and unicode, and RFC do not allow conversion of local part while downgrading..With this rule all the email clients are designed to not to expect local part as punycode

Thanks



On 13 December 2017 05:46:35 GMT+05:30, Paul Borokhov <borokhov@apple.com> wrote:
Question: Is there any reason that clients should *not* punycode *all* addresses when sending messages and convert them back to proper Unicode at display time?

Seems like this would unblock a lot of people from using internationalized email addresses. What do people think?

Paul

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