set up a wordpress email (action must match hook)

wordpress-email.php

<!-- functions.php -->

<?php
add_action('wp_enqueue_scripts', function () {
  wp_enqueue_script('main', plugins_url( 'main.js', __FILE__ ), ['jquery'], '1');
  wp_localize_script('main', 'php_vars', [
    'ajax_url' => admin_url('admin-ajax.php'),
    'ajax_nonce' => wp_create_nonce('horses-outsmarting-sharks'),
  ]);
});

add_action('wp_ajax_sendEmail', 'wp_sendmail');
add_action('wp_ajax_nopriv_sendEmail', 'wp_sendmail');

function wp_sendmail() {
  check_ajax_referer('horses-outsmarting-sharks', 'security');
  $foo = sanitize_text_field($_POST['foo']);
  $to = sanitize_email($_POST['email']);
  $subject = 'hi';
  $headers = ['Content-Type: text/html; charset=UTF-8'];
  $body = 'hi there ' . $foo;

//   optionally create an html template
//   $opts = ['http' => ['header' => "User-Agent:MyAgent/1.0\r\n"]];
//   $context = stream_context_create($opts);
//   $body = file_get_contents(__DIR__ . '/template.html', false, $context);
//   $body = str_replace('*|FOO|*', $foo, $body);

  wp_mail($to, $subject, $body, $headers);
  echo json_encode(['result' => 'success']);
  wp_die();
}

?>




<!-- main.js -->

<script>
  $(function () {
    $('.send-email').click(sendEmailTemplate);
  });
  function sendEmailTemplate(e) {
    $.post(php_vars.ajax_url, {
      action: 'sendEmail',
      security: php_vars.ajax_nonce,
      email: 'jim@example.com',
      foo: 'bar'
    }, function (result) {
      console.log(result);
    });
  }
</script>