Feedbin
If so, Feedbin is the service for you. It's the ultimate centralized command center for any and all reading, from any device. With newsletters, specifically, it gives you a custom email address that you can then use to sign up for any newsletters you want, just like with the other services I've covered. But that's where the similarities end. As an all-purpose reading service, Feedbin acts more like a feed reader-kind of like a supercharged version of the old Google Reader concept. You can type in the address of most any website, Twitter user, or RSS feed to add it into your mix, and you'll then see every new item from every source you add in a single streamlined list on the Feedbin website.