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You can easily do this using the Email button in the issue or using the Email This Issue Workflow Postfunction to automate approval request emails when the issue goes to "Approval in progress".
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e.g. add two transitions called "Approve" and "Unapprove" to a status you like e.g. "Approval in progress".
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Configure Field Rules
Field Contexts and Field Rules allow you to manipulate issues and issue fields based on email content.
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