Once you start building mailing lists for marketing purposes, you will find that there are tools and services out there to help simplify the process.
There's no reason why you have to learn how to build a responsive mailing list from scratch when you can use the tools and services provided by others. Just make sure that they are simplifying your life and not complicating it. Here are some tools or services that can help you do just that, while encouraging your subscribers to be more responsive.