As a test, I randomly choose 28 domains from Alexa's top 100 Sites and tried to create a user account with the email address user@宫殿.com.
The bleak result: only wikipedia.org accepted the IDN - and later on failed to send a verification ping - all other rejected the email address.
IDN domains have standardized since March 2003 (RFC 3490) but as far as I know only one major email provider actually supports IDNs flawlessly…
The tested domains in alphabetic order were: adobe.com, amazon.com, bing.com, blogger.com, cnet.com, cnn.com, conduit.com, craigslist.org, dailymotion.com, deviantart.com, ebay.com, facebook.com, hi5.com, imageshack.us, imdb.com, linkedin.com, live.com, livejournal.com, mediafire.com, megaupload.com, mininova.org, myspace.com, nytimes.com, photobucket.com, twitter.com, wikipedia.org, wordpress.com, youtube.com
By Th. Kühne
|Data Center||Policy & Regulation|
|DNS Security||Regional Registries|
|Domain Names||Registry Services|
|Intellectual Property||Top-Level Domains|
|Internet of Things||Web|
|Internet Protocol||White Space|
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