I would suggest thermite and small amounts of radioactive materials to remove any remains.
On a more serious note, is this legal small print actually of any help? Or, in other words, is it remotely sensible to try to forbid people from ‘taking actions’ upon unauthorised receipt of an email?
On a more serious note, is this legal small print actually of any help? Or, in other words, is it remotely sensible to try to forbid people from ‘taking actions’ upon unauthorised receipt of an email?