Rub'nSmell® scented varnish inks are approved for mailing by the Postmaster General, as long as the scented surface is covered or contained within the mailed piece. Therefore Rub'nSmell® on magazine ads or on inserts and blow-ins would be acceptable as long as the printed surface is contained within the magazine. Postcards or direct mailers printed with Rub'nSmell® would need to either be a fold-over design with the scent area covered by the flap or over wrapped.