header field indicating an anonymous address

Marc R. suggests that we standardize on a header field to indicate that a message was anonymous. I suggest "Anon-Sender:". There's already a "Sender:" field in RFC-822, indicating who sent the message, as separate from who wrote the message. The "Anon-Sender:" field should contain an email address for the maintainer of the remailer. Why? To facilitate complaints. :-) Eric