No Internet marketing strategy is more important than Email. If you are using WordPress as a Content Management System you can now easily add “opt-in” forms with a few clicks.

I personally use Aweber and Constant Contact for my Email and I really like them both. I also have clients using each of the following which, in my opinion, are the best Email Plugins for WordPress: MailChimp List Subscribe Form, Constant Contact for WordPress, AWeber Web Form Plugin