GNOME Bugzilla – Bug 509205
Make iso-2022-jp the default character set for Japanese Language
Last modified: 2021-05-19 11:32:17 UTC
In e-mail for Japanese Language, the default character set must be iso-2022-jp. Moreover, in the header, Japanese text must be encoded in the form of mime-encoded iso-2022 with base64. So, for example, in the subject line, Japanese text must not be encoded in the form of =?utf-8?q?...?=, but =?iso-2022-jp?b?...?=. Distribution: Ubuntu 7.10 (gutsy) Gnome Release: 2.20.1 2007-10-19 (Ubuntu) BugBuddy Version: 2.18.1
isn't iso-2022-jp a subset of utf-8? so what's the issue here? why "must" it be iso-2022-jp?
Iso-2022-jp is independent from UTF-8. See RFC 1468. Iso-2022-jp is pure 7bit code so that Japanese texts can be exchanged before MIME was defined. Japanese people have used iso-2022-jp for e-mail since 1986. On the other hand, Japanese people do not use UTF-8 nor UTF-7 for e-mail. Therefore, all MUA's must take iso-2022-jp for e-mail in Japanese texts.
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