let debug_mode = true;

// Filters out emails sent on behalf of some other server they might be impersonating
// E.g. mg3.ceipalmm.com 

// TODO: put your own mail domains in this array.  Mine are samples.
var my_blacklisted_domains = [
  "X-Feedback-Id: postmaster@mg3.ceipalmm.com"
,"X-Feedback-Id: postmaster@mg4.ceipalmm.com"]; 

function filterViaSpam() {
  var threads = GmailApp.getInboxThreads(0, 50);
  for (var i = 0; i < threads.length; i++) {
    var messages=threads[i].getMessages();
    debug_mode && console.log('message count: ', messages.length)
    for (var j = 0; j < messages.length; j++) {
      var message=messages[j];
      var body=message.getRawContent();
      var subject = message.getSubject();

      debug_mode && console.log('subject:', subject)
      for(var k = 0; k < my_blacklisted_domains.length; k++){
        var domain = my_blacklisted_domains[k];

        debug_mode && console.log('checking for domain with name: ', domain)
        if(body.indexOf(domain)>-1){
          console.log('message:', message)
          debug_mode && console.log('body:', body)

          GmailApp.moveThreadToSpam(threads[i]);
        }
      }
      Utilities.sleep(1000);
    }
  }
}