International Characters in Notification E-mail Subjects
Why are international characters in notification email subjects are being replaced with '?'
This happens if the system encoding is not the same as the JIRA encoding (by default UTF-8). System encoding can be seen in Administration -> System -> System Info, and JIRA encoding can be seen in Admin -> Global Settings -> General Configuration.
If there is a discrepancy, this can be fixed by setting the system encoding with a command-line option (-Dfile.encoding=utf-8) when starting JIRA. Eg. with Tomcat (JIRA Standalone), set the following before running the startup script:
See Setting Properties and Options on Startup for instructions.