How to disable notification mail from parent if subtask estimation changes

When I change the estimation time of a subtask, my colleagues get two notification mails. One for the subtask and one for the parent.
Can this be disabled so only one mail is sent?
1 comment
We have some issues that are nested in 3 levels. If we add work time to the task, we get 3 mails. One from the task and one from eah parent.
Can this be disabled?

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