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International email (IDN email or Intl email) is email that contains international characters (characters which do not exist in the ASCII character set), encoded as UTF-8, in the email header and in supporting mail transfer protocols. The most significant aspect of this is the allowance of email addresses (also known as email identities) in most of the world's writing systems, at both interface and transport levels. == Email addresses == Traditional email addresses are limited to characters from the English alphabet and a few other special characters.〔(RFC 5322 ): Internet Message Format〕 The following are valid traditional email addresses: Abc@example.com (English, ASCII) Abc.123@example.com (English, ASCII) user+mailbox/department=shipping@example.com (English, ASCII) !#$%&' *+-/=?^_`.~@example.com (English, ASCII) "Abc@def"@example.com (English, ASCII) "Fred Bloggs"@example.com (English, ASCII) "Joe.\\Blow"@example.com (English, ASCII) A Russian might wish to use ''дерек@екзампил.ком'' as their identifier but be forced to use a transcription such as ''derek@example.com'' or even some other completely unrelated identifier instead. The same is clearly true of Chinese, Japanese and many other nationalities that do not use Latin scripts, but also applies to French and Polish users whose addresses might contain diacritics (e.g. ''André'' or ''Płużyna''). As a result, email users are forced to identify themselves using non-native scripts - or programmers of email systems must compensate for this by converting identifiers from their native scripts to ASCII scripts and back again at the user interface layer. International email, by contrast, uses Unicode characters encoded as UTF-8 - allowing for the encoding the text of addresses in most of the world's writing systems.〔(RFC 6530 ): Overview and Framework for Internationalized Email〕 The following are all valid ''international email addresses'': 用户@例子.广告 (Chinese, Unicode) उपयोगकर्ता@उदाहरण.कॉम (Hindi, Unicode) юзер@екзампл.ком (Ukrainian, Unicode) θσερ@εχαμπλε.ψομ (Greek, Unicode) Dörte@Sörensen.example.com (German, Unicode) Marilù.Gioffré@esempio-università.it (Italian, Unicode) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「International email」の詳細全文を読む スポンサード リンク
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