phishme.js

function findPhishMeSpam() {
  var header_re = /^X-PhishMeTracking:/m;
  var l = GmailApp.getUserLabelByName("PhishMe")
  var threads = GmailApp.getInboxThreads(0, 20)
  for (var i = 0; i < threads.length; i++) {
    var t = threads[i]
    var messages = t.getMessages()
    for (var j = 0; j < messages.length; j++) {
      var m = messages[j]
      var raw = m.getRawContent()
      var headers = raw.substring(0, raw.indexOf("\r\n\r\n"))
      if (headers.search(header_re) >= 0) {
        t.markUnimportant()
        t.markRead()
        t.addLabel(l)
      }
    }
  }
}