function sendOneReminder(email, taskName) {
  if (!email) return;
  var subject = 'Reminder: ' + taskName + ' is due today';
  var body = 'Hi,\n\nThis is a reminder that "' + taskName + '" is due today.\n\n- Task Reminder Bot';
  GmailApp.sendEmail(email, subject, body);
}

function onFormSubmit(e) {
  // Re-run the reminder pass whenever the task sheet gets a new row.
  sendReminderEmails();
}