WP redirect rule doesn't work

I'm trying to redirect the page http://ift.tt/1uB7xm1 to http://ift.tt/15TALXS.

I have tried the following:

add_rewrite_rule('newsletter/unsubscribe.html$', 'newsletter/unsubscribe', 'top');

If I var_dump the global wp_rewrite i see the following rule added:

  ...
  public 'non_wp_rules' => 
    array (size=1)
      'newsletter/unsubscribe.html$' => string 'newsletter/unsubscribe' (length=20)
  ...

Does anyone know what I am missing?