? Question about ContactController.php (v. 1.4.8.2)

[mp88]

Question is simple:
 
When this part of ContactController.php code (lines 194-211) sends a confirmation email to customer?

					if ($ct->id)
					{
						$cm = new CustomerMessage();
						$cm->id_customer_thread = $ct->id;
						$cm->message = htmlentities($message, ENT_COMPAT, 'UTF-8');
						if (isset($filename) AND rename($_FILES['fileUpload']['tmp_name'], _PS_MODULE_DIR_.'../upload/'.$filename))
							$cm->file_name = $filename;
						$cm->ip_address = ip2long($_SERVER['REMOTE_ADDR']);
						$cm->user_agent = $_SERVER['HTTP_USER_AGENT'];
						if ($cm->add())
						{
							if (empty($contact->email))
								Mail::Send((int)self::$cookie->id_lang, 'contact_form', Mail::l('Your message has been correctly sent', (int)self::$cookie->id_lang), array('{message}' => stripslashes($message)), $from);
							self::$smarty->assign('confirmation', 1);
						}
						else
							$this->errors[] = Tools::displayError('An error occurred while sending message.');
					}