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Symptoms

Japanese characters displayed as '?' in email, even though the equivalent text is displayed correctly in the web User Interface.

Cause

The ISO-2022-JP encoding cannot encode all the Japanese Kanji characters. For example, the characters "①~⑳髙㌔㌢㍍㍍㊤㊥㊦㊧㊨㈱㈲㈹㍾㍽㍼㍻" cannot be encoded correctly.

When trying to send the e-mail JIRA converts characters than cannot be encoded into ISO-2022-JP as '?'

Resolution

Change the mail encoding to UTF-8 or another encoding that can represent all characters. To do this, set the system property JAVA_OPTS=-Dfile.encoding=utf-8. See Setting Properties and Options on Startup for instructions.

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