我无法在CodeIgniter纯文本电子邮件中获得行返回

I've been struggling with this one. No matter what I do, I cannot get new lines, empty lines, or line returns to show up in any email message I generate with CodeIgniter (v 2.1.3).

Within my Controller function:

$message = "Line one.

" .
"Line two.

" .
"Line three.

";

$subject = "My Subject Line";

$this->load->library('email');                  
$config['newline'] = "
";  // does not matter when I leave this out
$config['crlf'] = "
";     // does not matter when I leave this out
$this->email->initialize($config);              
$this->email->from('system@mydomain.com', 'my system');
$this->email->to('me@gmail.com');               
$this->email->subject($subject);
$this->email->message($message);                
$this->email->send();               
echo $this->email->print_debugger();

I've changed no settings or defaults, other than what I've shown above.

The "source" of the message looks just like this print_debugger() output...

User-Agent: CodeIgniter
Date: Sun, 24 Mar 2013 17:46:47 -0400
From: "my system" 
Return-Path: 
Reply-To: "system@mydomain.com" 
X-Sender: system@mydomain.com
X-Mailer: CodeIgniter
X-Priority: 3 (Normal)
Message-ID: <xxxxxx@mydomain.com>
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="B_ALT_514f74472bd26" 

=?utf-8?Q?My_Subject_Line?=
This is a multi-part message in MIME format.
Your email application may not support this format.

--B_ALT_514f74472bd26
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

Line one.

Line two.

Line three.

--B_ALT_514f74472bd26
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable

Line one.

Line two.

Line three.

--B_ALT_514f74472bd26--

HOWEVER, the problem is that the actual message is rendering in all email clients as the following.

Line one.Line two.Line three.

Why are my " " being ignored?

This is a very simple message and I'd prefer to not have to use any html options. As per CI documentation, the mailtype preference should be defaulting to text.

Where am I going wrong here?