the user must be logged in before they can subscribe / unsubscribe to a mailing.
the user should log in before trying to fill in the subscription form and should also login before trying to unsubscribe.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.