I'm using the "Email Users" feature to send out newsletters to all my active members. I'd like to add an unsubscribe link that automatically unchecks the "Receive site mailings" option in a user's profile without them having to login. I know that I can link directly to their profile to have them login and opt out of future mailings: http://xenforo.com/community/account/contact-details ... but I feel like I need to provide a direct link to this option without having to make them login. Is this possible? Thanks!