Outlook has a function that allows you to set up mail rules. I have one that says if an email contains the word "forward", "forward:", "frwd", "fwd:" or any variation, to return the email to its sender with the following note attached: "This address does not accept forwarded emails. Please remove me from any group lists you may use for mass forwarding of emails. Thanks!"
This way I never have to see the crap. They get the message every time they "forget" and send me an email showing receipts for Michelle Obama's ten $50 steaks. So, sooner or later, they all get the hint and actually think before sending me something. And if they get worked up or insulted, I just tell them "the computer rejects it automatically, don't take it personally."
Art has a double face, of expression and illusion.