Create a Google Workspace Add-On to turn on a user’s native Gmail autoreply (aka Vacation Responder) by checking the user’s Google Calendar for native Out of Office events. Include a message that states that the user is out of the office and their returnDate to the office.
Full brief here: https://docs.google.com/document/d/1cziwroOCFA9T2PBa4ePwsRyOPZOz68LMtIuyz3XiQDc/edit?usp=sharing
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