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.
I use Aweber to run my Email marketing campaign as they are cheap and their policies are perfect for bloggers and affiliate marketers. More over you can start with $1 only and within one month you can decide if you want to continue with it or not. This is how I started and I suggest you to get started now before it’s too late. To start with, create your Aweber account using below link, which offers 30 days free trial.
Using the Personalize dropdown, you can insert custom snippets like your subscribers first name, or sign up date, and AWeber will automatically insert that data specific to each subscriber if we have it. If you collect first name, for example, you can send an email that says Hello Tom, or Hello Mary, or Hello John, depending upon who you’re sending to.