I'm not exactly sure what you want to know about the newsletter changes. Therefore, in short, the new newsletter features are as follows: the newsletter form in the left column allows customers and non-customers to subscribe and unsubscribe to the store's newsletter without logging in or even creating an account (non-customer subscriptions are stored in a new table). It works by sending a confirmation email for subscribe and unsubscribe requests to the entered account. In each email, there is a customized link to click to confirm the request (fulfills a double opt-in requirement for subscriptions). To prevent abuse, only one email is sent per day to an account. When the newsletter is sent, the custom unsubscribe link is included in the campaign as it was a requirement from the web host (one-click unsubscribe). Newsletters can also be viewed online -accessed by a link in the campaign or optionally from the Newsletter page. Store administrators can also manage non-customer subscriptions in Administration by unsubscribing non-customers and sending subscription confirmations (can't directly subscribe an unconfirmed account). Hopefully this answers your questions.