Your Inbox is Not a Task Manager: Turning Gmail Into an Automated Workflow Engine

function processInbox() {
  const threads = GmailApp.getInboxThreads();
  const today = new Date();
  
  threads.forEach(thread => {
    // 1. Newsletter Cleanup
    const labels = thread.getLabels();
    const isNewsletter = labels.some(l => l.getName() === 'Newsletters');
    
    if (isNewsletter) {
      const lastMessageDate = thread.getLastMessageDate();
      const diffDays = (today - lastMessageDate) / (1000 * 60 * 60 * 24);
      
      if (diffDays > 7) {
        thread.moveToArchive();
        Logger.log(`Archived: ${thread.getFirstMessageSubject()}`);
      }
    }
  });
}
 
function processSnoozes() {
  // Un-snooze "3 Day" followups (Simplified logic)
  // In reality, you'd store the "snooze date" in a Property or parse the label add-date
  // This is a placeholder for the logic:
  
  const label = GmailApp.getUserLabelByName("FollowUp/3Days");
  const threads = label.getThreads();
  
  // Logic: If thread hasn't been replied to, mark unread and bump to top
  threads.forEach(t => {
     t.moveToInbox();
     t.markUnread();
     // Remove label so it doesn't loop
     t.removeLabel(label);
  });
}