Issue has some subtasks, every subtask has an assignee, on any subtask change (edit, comment or transition) in any subtask - all of subtasks assignees receive notification email
How to do this ?
you have to write your own listener and use custom code to send emails.
check the following plugin it may help you
https://marketplace.atlassian.com/plugins/com.riadalabs.jira.plugins.notificationassistant/server/overview
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