Run at https://script.google.com/

spamEmail.gs

//config
var email = ""
var subjet = ""
var body = ""
var timesToRun = 10
//no toutch
var times = 1
function myFunction() {
  if (times == timesToRun + 1) {
    // +1 to make it not stop early
     console.info("Done")
  } else {
  GmailApp.sendEmail(email, subject, body)
  console.info("Sent mail", times + "/" + timesToRun)
  times = times + 1
  myFunction()
  }
}