CreateSpamDomainFilter.js

function createDomainBlockFilter(emailAddress,domain) {

  // Create a new filter object
  var filter = Gmail.newFilter();
    
  /* 
      Filters in gmail have criteria
      The criteria is the basis on which the filter is applied (e.g. the rule that enables the filter's action).
      In this case the criteria is that the email is sent from the same address as the sender of the current thread.
  */ 
  filter.criteria = Gmail.newFilterCriteria();

  /* if gmail use email address */
  if (domain == 'gmail.com') {
    filter.criteria.from = emailAddress;
  } else {
    filter.criteria.from = domain;
  }

  /* 
      Filters in gmail have actions
      The action is what will be performed when the criteria is met.
      In this case the action is that the email is marked as read and archived.
  */
  filter.action = Gmail.newFilterAction();
  filter.action.removeLabelIds = ['INBOX'];
  filter.action.important = false;
  filter.action.notImportant = false;
  filter.action.star = false;
  filter.action.trash = true;
  filter.action.spam = true;

 /* try catch */
 try {
  /*
      get the email address of the person whose account is running the script
      In my case, this would be me. In your case, this will be your email.
      We could also just use the string 'myemail@example.com', but I'm trying to avoid putting my personal email
      in this code.
    */
    var me = Session.getEffectiveUser().getEmail();

    /* Create the filter */
    var response = Gmail.Users.Settings.Filters.create(filter, me);

    /* check if gmail.com domain */
    if (domain == 'gmail.com') {
      /* Log that the filter was created */
      Logger.log("Creating Email Filter From: [" + emailAddress + "]");
    } else {
      /* Log that the filter was created */
      Logger.log("Creating Domain Filter From: [" + domain + "]");
    }
 }
 catch(err) {
  /* Logger.log(err); */
 }

}

function getDomainFromEmailAddress(emailAddress) {
  var domainRegex = /@(.+)/;
  var match = domainRegex.exec(emailAddress);
  
  if (match && match.length > 1) {
    return match[1];
  } else {
    return null;
  }
}

function GetSpamMessages() {
  /* get all spam threads */
  var threads = GmailApp.getSpamThreads();
  
  /* loop thru all threads */
  for (var i = 0; i < threads.length; i++) {

    /* get all messages for this thread */
    var messages = threads[i].getMessages();
    
    /* loop thru all messages */
    for (var j = 0; j < messages.length; j++) {
      
      /* get current message */
      var message = messages[j];
      
      /* get message id */
      var messageId = message.getId();

      /* now show from */
      var emailAddress = message.getFrom().replace(/^.+<([^>]+)>$/, "$1");

      /* get domain name */
      var domain = getDomainFromEmailAddress(emailAddress);

      /* create new filter for this domain */
      createDomainBlockFilter(emailAddress,domain);

      /* move message to trash */
      message.moveToTrash();
      

    }
  }
}
GetSpamMessages();