Hey! If you want to try it, our Issue Merger is available on Marketplace: https://marketplace.atlassian.com/apps/1226682/issue-merger?hosting=cloud&tab=overview We love it, and decide to keep it as a free app! Enjoy!
Issue Merger
Are you tired of duplicated issues? Your customer replied from a different email address and created new issue? With Issue Merger you can easily merge many tickets into target issue or create new one.
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