Move Incoming NGPVAN Political Emails in Gmail to Spam (Google Apps Script)

Filter-NGPVAN-Political-Emails.md

1. Go to https://script.google.com
2. Create a New Project
3. Replace the Code.gs file it creates for you with the javascript below (copy/paste)
4. Save the script
5. Go to Triggers (looks like an alarm clock on left-hand side)
6. Create a Trigger that acts every 10 minutes and calls filterNGPVANSpam
7. You'll need to authorize this script to act on your behalf, which may require that you use the scary "Advanced" section to allow the script to read/write to your email inbox.

filterNGPVANSpam.js

// Adapted with thanks from:
//   https://www.geektron.com/2014/01/how-to-filter-gmail-using-email-headers-and-stop-via-spam/

function filterNGPVANSpam() {
  var threads = GmailApp.getInboxThreads(0, 5);
  threads.concat(GmailApp.search('category:promotions', 0, 5));
  for (var i = 0; i < threads.length; i++) {
    var messages = threads[i].getMessages();
    for (var j = 0; j < messages.length; j++) {
      var message = messages[j];
      var body = message.getRawContent();

      var matchedNGPVAN =
        body.match(/^List-Unsubscribe:\s*<(.*ngpvan\.com.*)>\s*$/m) ||
        body.match(/^Received:.*ngp(van|web)\.com/m);

      if(matchedNGPVAN){
        GmailApp.moveThreadToSpam(threads[i]);
      }
      Utilities.sleep(500);
    }
  }
}