email notification when anybody try to close parent issue until closing child link issue

[Sys Admin]

We have configured Preventing parent issue from being closed until child linked issue status is closed using "Jira Workflow Toolbox" plugin. Now we need to send email notification whenever a user want to close parent issue without closing child link issue. I.E - test1 is parent issue and test2 child issue. If anybody try to close test1 until closing test2 then a email notification should be generated like - "Linked issues must be closed before closing parent issues". Also please note I am not talking about subtasks. The issues are normal tasks but linked

[Steve Thornhill]

You would probably need to add additional plugins such as JEMH for the mail handling.

Would it be possible to just hide the close transition from the parent until all the child issues are closed, along the lines of a similar question - https://answers.atlassian.com/questions/90108/preventing-issue-from-being-closed-if-has-is-blocked-by-issue-linked