opencart本地测试不能发送邮箱mail.php问题

E:phpStudyPHPTutorialWWWopencart30-2uploadsystemlibrarymailmail.php

if ($this->parameter) {
         mail($to, '=?UTF-8?B?' . base64_encode($this->subject) . '?=', $message, $header, $this->parameter);
      } else {
//       mail($to, '=?UTF-8?B?' . base64_encode($this->subject) . '?=', $message, $header);
      }