Before the advent of the internet & email, companies used to exclusively mailshot people with leaflets & the usual bumf
Nowadays they are able to save costs by emailing potential punters
A good case in point is utility companies no longer sending paper bills; instead they send emails with that information
Also those companies who still send out paper bills charge around £1.80 to send a paper bill to you
So to save paying the £1.80 you can opt for bill by email