php使用Pear的NetMail发送smtp邮件

$params = array('host' => 'localhost',
                'port' => '25',
                'username' => 'test@jbxue.com',
                'password' => 'test');
  //$to = $test_mail;
  $recipients = $to; 接收人，可以是一个数组来存放多个地址
  $headers['From']    = $email;
  $headers['To']      = $to;
  $headers['Subject'] = $subject;
  $body = $message;
  //选择smtp的发送方式，当然还支持mail()和sendmail
  $mail_object = &Mail::factory('smtp', $params);
  if (PEAR::isError($e = $mail_object->send($recipients, $headers, $body))) {
    die($e->getMessage() . "\n");
  }
  ?>