Abstract: A secure mailer/receipt business form including a top and bottom ply and at least one intermediate ply constituting a separable receipt part which receipt part is associated with image transfer material for imparting information onto the bottom ply, the rear face of the top ply including a coated adhesive material covering at least part of the surface, adhesive being coated with a releasable non-adhesive backing materials connected to the separable receipt part such that withdrawal of the separable receipt part will release the backing material to expose the adhesive layer to adhere the top ply to the top face of the bottom ply thereby sealing the top and bottom plies together after removal of the receipt part to restrict tampering with the remaining business form without damage to the form.