How can I add a CC field to webform email send?
I have done some similar thing to send the email to another email-address. You can use the following solution for changing the content of the email or to add an attachment or things like this...

/**
 * Implements hook_mail_alter().
 */
function MYMODULE_mail_alter(&amp;$message) {
  // Check message id
  if ($message['id'] == '...') {
    $email_key = 'new_email_key_if_you_want';

    // Block email which is sending right now.
    $message['send'] = FALSE;

    // send original email
    drupal_mail('MYMODULE', $email_key, $message['to'], language_default(), $message['params'], $message['from']);

    // send copy of the email.
    drupal_mail('MYMODULE', $email_key, 'ticket_system@domain.com', language_default(), $message['params'], $message['from']);
  }
}


You can add this in an own module, in the MYMODULE.module.