PHP Script: Will not send activation email

I have a PHP Login Script that I have gotten to work except for one part, it does not send the activation email when I include a URL in the message. Here is the piece of code I have. Could someone please tell me what is wrong. Thanks

mail ( $email , 'Registration Confirmation' , 'Thanks for registering. Your confirmation code is attached below http://www.college9.net/activate.php?code=' , $code );

PHP:

 

There is a problem with the last part of your code. I believe that

, $code

Code (markup):

should be

. $code

Code (markup):

 

I assume $code doesn't contain headers information ?

mail($email, 'Registration Confirmation', 'Thanks for registering. Your confirmation code is attached below http://www.college9.net/activate.php?code=' . $code);

PHP:

 

Try this:

  <?php

       $subject = "Subject here";
       $message = "Hello,

       Message can be here";
       $headers = "From: support@example.com" . "\r\n" . 
       "Reply-To: support@example.com" . "\r\n" . 
       "X-Mailer: PHP/" . phpversion();
          mail($email, $subject, $message, $headers);

   ?>

PHP:

Hope i helped.