subscribers to my blog vs members

So originally I set up my blog using Wordpress and now have a small list of blog subscribers. Then I developed a 30 day menu to sell on my blog and used the Membership plugin to set up a way for people to pay to get access to the menu. And so now I have one list of subscribers to my blog and one list of members for my menu. But I would like for those people who sign up for my menu to also have to subscribe to my blog so that I have one email list to use to email all my subscribers/members. Is this possible?