Standard email list unsubscription protocol

Just to be clear, I'm not talking about spam here. I get a lot of email from companies who I've given my email address to, and who send emails to me with detailed, working, instructions for unsubscription. The problem is, often I can't be bothered to download the email, scroll to the bottom, click on the "Unsubscribe" link and do whatever it says.

So, I propose that there should be a standard unsubscription method. It would probably be done by forwarding the email and your email address to an email address supplied in a header field of the original email. This would mean that unsubscribing to emails could become a feature of your email client. So, without having to open the email, you could select it and choose 'Unsubscribe' from a menu.

Adhering to an easy unsubscription method like this might seem counterproductive to the companies sending out emails, but in fact they don't want to send emails out to people who aren't reading them anyway (but who find it easier to delete the email rather than unsubscribe), and if it is generally known that it will be easy to unsubscribe, more people will sign up for these emails.