Automatically forward emails from Gmail's inbox to Expensify

gmail_to_expensify.js

// Forwards all emails in the inbox from `from_email` to Expensify, and archive them.
//
// To use:
// Add this function to a Google Apps Scripts project, and add a trigger (in Resources -> Current Project Triggers)
// to call it on a given interval. 
// Make sure to specify the senders you'd like to forward!


function toExpensifyBySender(from_email) {
  var threads = GmailApp.search('from:' + from_email + ' in:inbox');
  for (var i = 0; i < threads.length; i++) {
    var messages = threads[i].getMessages();
    for (var j = 0; j < messages.length; j++) {
      messages[j].forward('receipts@expensify.com')
    }
    GmailApp.moveThreadToArchive(threads[i]);
  }
}