The best way to collect email addresses to market to is to use a email marketing service.
Email Marketing Services
- AWeber ( Most Popular ) – All the tools you need to send emails the right way.
- MailChimp – Simple interface for email marketing, manage subscribers, send emails, and track results.
Mailchimp vs. Aweber
Once you pick a email marketing service provider, do a google search for “WordPress Aweber Plugins” for example to find helpful plugins you can use with their service.
Simple Aweber Optin Widget
AWeber Forms by Optin Cat
- How Do I Use AWeber’s Webform Widget For WordPress?
- How to Send a Free Download to a Email Subscribers with Aweber
- How Do I Add A Form To My WordPress Page?
- What Are All Of The Options For Sign Up Forms? ( Pop Up Window )
- Aweber Premium Paid Plugins
- AWeber Web Form Plugin
- AWeber Integration
- Simple Aweber Optin Widget
- Mailchimp Premium Paid Plugins
Please note: I have not tested any of these plugins and do not provide support for them.