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I am receiving email notifications but how should i approve or reject a task through it?
There might be a link in the email (if it was developed such a way) that will redirect you to the SharePoint site to approve/reject tasks.
When you are redirected to the list item page, you need to click “Edit Item” in the ribbon.
Then it will redirect to the edit form page with the “Approved/Rejected” options under the columns.