This is a simple script to extend GMail functionality with a label named "tomorrow".
Where I move a thread (it's a GMail conversation) to "tomorrow", the day after the thread is moved again to my inbox and marked as unread.
Google Apps Script (https://developers.google.com/apps-script/) is the technology used.
Usage:
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I create an Excel doc on Google Drive
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I paste the script in this repository into the script editor in Tools->Script Editor and save.
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Then I trigger a daily execution (from 24:00 to 1:00) of the daily function of my script.