How to stop the following mailer notification- The task has been completed and no longer required

Summary: Hello Oracle Experts! When the PO/ PR is approved from Email, once the PO/PR is approved, the approver is getting a automatic notification from the Oracle mailer saying that "The task has been completed and no longer required your response. You may simply delete original email along with this message".

The approvers are getting annoyed with this notification and how can this notification be stopped?

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