NOTE: If setting up a MailChimp Integration after May 20th, 2026 please follow this guide: MailChimp OAuth Integration
You can integrate your Retention.com account directly with MailChimp.
An integration between Retention.com and MailChimp does three things:
Automatically sends contacts acquired in your Retention.com account to MailChimp, into a list of your choosing.
Automatically suppresses existing contacts in your MailChimp account, to avoid redundancies or to avoid sending existing contacts.
Ability to set up custom filters to sync filters (ie, send leads from different domains to different lists or ESPs).
What you’ll need
1. Your MailChimp API key. This can be found in MailChimp by clicking your profile photo/name and then clicking Account & Billing.
2. Click Extras and then API keys.
3. Scroll down to Your API keys, and copy the API key. If you don't have one, click Create a Key.
To get started
1. Click on Integrations from the left navigation panel in Retention.com. Then, click Available Integrations at the top and choose the MailChimp icon.
2. Enter your MailChimp API Key and then click Connect. Activate Grow and/or Reclaim.
3. Set up Contact Suppression. Once you enable automatic suppression, Retention.com will sync your regular, opt-in list from your ESP and add it to your Retention.com suppression list. This prevents you from paying for contacts you already have and powers our Reclaim product. Once you’ve enabled this option, the sync will run daily at 6 p.m. EST.
Choose YES to suppress contacts.
4. Select a list to sync to (which is your Audience in Mailchimp). Optional: You can also choose to include a Tag here. Select the Store you'd like to sync contacts and events to within Store.
5. Enable the Reclaim Sync, this will enable Add to Cart Reclaim (only) for the MailChimp integration. Then, click Next.
6. Enable the integration. Once you enable the integration, your suppression and collection sync settings will apply and begin. Then, click Finish.
6. Once the integration is complete, you will see the integration date, API details, contact suppression, and the option to set/change the list it's synced to. You can also Remove the integration from this page at the top.
Integration settings
From your Integration settings, you can access, change, or update any of the following:
Your API key
Grow or Reclaim Activation
Suppression settings
Grow Sync settings, including the list you're syncing contacts to
Revenue metric
Sync summary
Reclaim sync
To access any of these settings, click Integrations > Dots > Settings.
Sync summary
You can view your daily sync history under Sync Summary on your integration page. It will show you the date, number of completions, if there are any failures, and the number that are in the queue.
To access all of your sync history, click View Full History under Sync Summary. If there's a failure, it will show the email address, what type of failure has occurred under ESP Feedback, and the date and time of the failure.
If you have questions about the error message, you can contact support at support[at]retention[dot]com.