Support German Umlaut in e-mail-adresses

[Hardyyes]

Dear Thunderbird Team.

Just recently I wanted to send a mail to an e-mail-adress containing the German Umlaut "ü".
After touching the sending-button it shows: Failed to send the message.
If the domain-string right of the @ contains an Umlaut (ÄÖÜäöüß) the string has to be converted in a ACE string (punycode, starting with xn--), see IDN (internationalized domain name).
In IPhone-Mail-App or MS-Outlook it was converted automatically.
For Thunderbird I have to convert it with the IDN-Web-Converter from denic.de and copy the string result to Thunderbird [To:].

It would be fine if Thunderbird would also change it automatically (also backwards when receiving email-addresses with ä,ö,ü,...) .

Thanks for your great work.

[Jon]

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