/*
This script, when used with Google Apps Scripts will delete 500 emails and
can be triggered to run every minute without user interaction enabling you
to bulk delete email in Gmail without getting the #793 error from Gmail.

Configure the search query in the code below to match the type of emails
you want to delete
Browser to https://script.google.com/.
Start a script and paste in the code below. 
After you past it in, save it and click the little clock looking button.
This is for your triggers. You can set up how frequently you want the script
to run (I did mine for every minute).
Source : # https://productforums.google.com/d/msg/gmail/YeQVDuPIQzA/kpZPDDj8TXkJ
*/

function batchDeleteEmail() {
  var batchSize = 100 // Process up to 100 threads at once
  var threads = GmailApp.search('label:inbox from:user@example.com');
  for (j = 0; j < threads.length; j+=batchSize) {
    GmailApp.moveThreadsToTrash(threads.slice(j, j+batchSize));
  }
}