Fillable form loses fillable fields when emailed - how do I fix
 

I have created a fillable form using the foms tookbar. I would like to email
the form to others to fill in the appropriate boxes and information.
However, when I send the form as an email it loses it form properties and is
unable to be fill in. If I send it as an attachment it is okay, but I want
to be able to send it using the email icon on the workbook page.