Faxing
Yup still in the stone age. Faxes are a loophole in communication security as you can really do information dissemination damage at the touch of a button. Email can be vetted server side and blocked as well as being much easier to trace from the average user.
Why the hell are they using fax machines? Game theorists should have told them how stupid it is.
Mind you at least they can still get offers to buy their caravan and some good holiday bargains in their in tray.