require_once '/Mbox.php';
mixed Mail_Mbox::insert (string $content, mixed [$offset = NULL])
mixed Mail_Mbox::insert
Mail_Mbox will insert the message according its offset. (Remember: message 3 is the forth message). The default is inserting it AFTER the last message (offset = null).
Note: Mail_Mbox automatically adds \n\n at end of the message
The content of the new message
returns Return true else PEAR_Error object.