According to documentation:
But, in my experience, emails from the same thread were filtered in the same issue (and there wasn't issue key in the email subject).
When you say "nothing happened", does it mean "neither comment nor new issue was created"?
I had problems with this fact, because sometimes a JIRA user participated in a thread mail, but he didn't have permissions to create issues or to comment issues in the project where mails were filtered.
I hope be useful.
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