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This series is about integrating MailChimp with Drupal 7 using the Drupal MailChimp module (https://www.drupal.org/project/mailchimp). It will help site builders and content creators create awesome email marketing campaigns and grow the number of subscribers on their mailing lists.
The Drupal Ladder is a community initiative to get more people involved with Drupal core. It breaks the whole process down into manageable steps on a ladder. Once you complete the first step, you can achieve the next step, etc.