This signature is at the bottom of every email from a company I’m in contact with at work, emphasis mine:
This e-mail may be confidential and privileged. Do not open it if you are in any doubt that you are the intended recipient. You must scan this e-mail and any attachments for the presence of viruses or any other unwelcome content. This e-mail must be read in conjunction with the important legal notice at …..
I don’t understand the complete misunderstanding of email/technology you need to deem silly things like this legally useful.