GMail domain filtering (VIA)

//one per line, without http:// etc, just domain-name.com or domainname.com ....
var domains = [
  'domainname.com',
];

  //This is not the best solution, a better solution would be to add a filter like this for example => From: #domainname.com
  //and then this app would read your GMail filters and test whether it begins with # to apply the next function if so.. but I couldn't find a way to read GMail settings from here

function filterVia() {
  // get all threads in inbox
  var threads = GmailApp.getInboxThreads();

  for (var i = 0; i < threads.length; i++) {
    Utilities.sleep(10);
    // get all messages in a given thread
    var messages = threads[i].getMessages();
    // iterate over each message
    for (var j = 0; j < messages.length; j++) {
      // log message subject
      var content = messages[j].getRawContent();

      for (var k = 0; k < domains.length; k++) {
        //make domain name as regexp
        var re = new RegExp('\\.|\\-', 'gi');
        var b = domains[k].replace(re, '\\$&');
        var regex = new RegExp("Received\: from .*" + b,'gim');
        var does_match = regex.test(content);

        if(does_match){
          //MARK AS READ (maybe spares you an unnecessary notification)
          messages[j].markRead();
          //DELETE THE MESSAGE
          messages[j].moveToTrash();
        }

      }
    }
  }
}