电子邮件的Codeigniter换行符不起作用

当我尝试用Codeigniter发送电子邮件时，电子邮件不会用换行符发送。我试过一些写得断断续续的技巧，但没有奏效。

这是我的代码：

 $message = 'Hi everyone'r'n';
 $message .= 'Today you can look at these sites'r'n';
 $message .= 'Have a good days';
 $config['charset'] = 'utf-8';
 $config['mailtype'] = 'text';
 $config['newline'] = ''r'n';
 $this->load->library('email');
 $this->email->initialize($config);
 $this->email->from('xxxxx@xxx.com');
 $this->email->to('aaaa@aaaaaa.com');
 $this->email->subject('Today New Sites');
 $this->email->message($message);
 $this->email->send();

我也试过了：

1.instead of putting 'r'n, I put only 'n and changed $config['newline'] = ''n'
2.I tried $this->email->message(nl2br($message));
3.I tried : str_replace(''r'n','"'r'n",$message);
4.I get rid of $config['mailtype']

请帮忙吗？