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Usually, we design a process to solve the main business problem, like in the example shown below. We exclude explicit tools for sending out email notifications to avoid complicating the process flow design.
The User Notification plugin is used to address this issue.
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Note: The User Notification plugin is designed for all activities in an app and not just for a selected few, but only one User Notification plugin can be configured per app. Nevertheless, it is possible for you to manually handle the notification for a specific activity by placing a tool after that activity in your process design, and then excluding it in the Activity Exclusion list in the User Notification plugin.