Mark NGPVan emails as spam

ngpvan.js

function filterNGPVANSpam() {
  // Look for emails containing "unsubscribe" sent in the past week.
  // This'll be more than just NGPVAN emails.  We'll look in their headers below.
  const lastWeek = new Date((new Date()).getTime() - 604800000)
  const lastWeekStr = lastWeek.getFullYear() + '/' + (lastWeek.getMonth()+1) + '/' + lastWeek.getDate()
  // The gmail query "unsubscribe after: DATE"
  const query = 'unsubscribe after:' + lastWeekStr
  // Search for any email thread that meets this criteria.
  const threads = GmailApp.search(query)
  for(let i=0; i < threads.length; i++) {
    // Get the messages for this thread.
    const messages = threads[i].getMessages()
    let threadIsSpam = false
    for(let j=0; (!threadIsSpam && j < messages.length); j++) {
      const message = messages[j];
      const body = message.getRawContent();
      const matchedNGPVAN =
          body.match(/^List-Unsubscribe:\s*<(.*ngpvan\.com.*)>\s*$/m) || // If the unsubscribe points back to spam source or
          body.match(/^Received:.*ngp(van|web)\.com/m); // the Received header points back to spam source.

        if(matchedNGPVAN){
          console.log('Found NGPVAN content. Moving thread to spam')
          console.log('From: ' + message.getFrom())
          console.log('Subject: ' + message.getSubject())
          threadIsSpam = true
          GmailApp.moveThreadToSpam(threads[i]);
          GmailApp.markThreadRead(threads[i]);
        }
        Utilities.sleep(500); // Wait 500 seconds.
      }
  }
}

ngpvan.md

Mark NGPVAN emails as spam & read

(Inspired by https://gist.github.com/canadaduane/b5da111903ff748429bd425227af271c)

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.