A WP plugin to send emails using Mailchimp, getting content from Wordpress as a regular template.
(1) Go to Settings/Mailchimp templates setup and set the mailchimp api key, and list ids for the test list and the "final" (serious) list Aswell as the email and name for the sender
(2) Copy the folder mailchimp-templates to your theme and create a custom template. Ideally shoud be self contained
(3) Go to the Newsletter option in the dashboard and try to send a campaign to the test list
(4) When you are done, send it to the final list
Enjoy!