Mailchimp is the world’s leading email marketing automation platform. The integration for X-Cart 5 is available in the add-on named Mailchimp Integration with eCommerce Support. It is a powerful tool that replaces X-Cart’s built-in newsletter subscriptions feature and enables you to access some exciting e-commerce features like product recommendations, abandoned cart messages, purchase-based automation, and sales reports.
To start using Mailchimp in your store, make sure the Mailchimp Integration with eCommerce Support add-on is installed. For general guidance on the add-on installation, please refer to Installing Add-ons from X-Cart App Store.
The Mailchimp add-on requires the basic Newsletter subscription add-on to be installed and enabled. If both addons are used at the same time, the 'Newsletter subscriptions' addon will be linked to Mailсhimp, and the subscriber email addresses submitted via the subscription form will no longer be stored to a list within X-Cart but will be handled via Mailсhimp, provided that your X-Cart store is connected to your Mailсhimp account via the addon settings, and the Mailсhimp Integration is configured properly.
If at the moment of switching to Mailchimp, your store has a list of subscribers formed by the addon Newsletter subscriptions, you should not expect these subscribers to be imported into Mailсhimp automatically. To use your existing subscribers with Mailсhimp, you will need to export them from your X-Cart store and import them into your Mailсhimp account. See https://kb.mailchimp.com/lists/growth/import-subscribers-to-a-list for information on how to import subscribers into Mailсhimp.