Pam, we are sure JetPack has nice features and all but it allows you to add a blog / comment subscription module only. On the other hand services like MailChimp and Aweber are professional email service providers offering many powerful features which allow you to really benefit from the email list you are building. As far as simplicity is concerned, we are slightly more inclined towards MailChimp, they have a great user interface even for absolute beginners, they have excellent documentation, and lots of resources to learn how to use each feature available.
FYI, this will show up at the of every email you send out to your subscribers. This is important because when you input your address in the Account Information section, you may have used the address associated with your credit card. This is usually a home address. So I’d advise renting a PO Box so you can use that address here. It keeps your home address private.
AWeber is an easy-to-use email marketing tool that allows business owners and entrepreneurs to cultivate relationships with their customers. Since 1998, AWeber has been the email engine powering the growth of organizations around the world, including leading sites like Social Media Examiner and ProBlogger and industry influencers such as Peter Shankman and Ann Handley.