This document describes the email approval workflow. This workflow includes features and email messages that can be configured and the links that can be included in the emails that contain links to documents that require action. For example, an employee enters a timesheet, and then submits it to his or her manager for approval. The manager receives an email message requesting approval. The email message contains a link to the timesheet that the user entered.
Microsoft Dynamics AX 2012 R2 White Paper: Workflow Approval via Email