Mailchimp
Connect your website to Mailchimp for email marketing and audience management
Overview
The Mailchimp plugin integrates your CMS Max site with Mailchimp, a widely used email marketing platform. Once connected, form submissions on your site can automatically add subscribers to your Mailchimp audience, keeping your email lists current without manual data entry.
Setup
- Navigate to Settings > Plugins
- Find Mailchimp and click to open the settings page
- Click Save and Install
Getting Your API Key
- Log in to your Mailchimp account
- Go to Account > Extras > API keys
- Click Create a Key
- Name the key (e.g., "CMS Max")
- Copy the generated API key
Connecting Your Account
- Paste the API key into the API Key field in the plugin settings
- The Region field auto-fills from the API key (e.g.,
us10orus20) - Click Save
- Select your Campaign (audience list) from the dropdown
- Click Save again
Configuration
API Credentials

| Field | Description |
|---|---|
| API Key | Your Mailchimp API key (locked after initial entry) |
| Region | Your Mailchimp data center region, auto-detected from the API key (e.g., us10) |
Once credentials are saved and locked, use the Clear API Credentials and Disconnect account button to reset and enter new credentials.
Campaign Selection

| Field | Description |
|---|---|
| Campaign | The Mailchimp audience (list) to add subscribers to. Use the refresh button to reload the list from Mailchimp. |
How Form Submissions Are Sent to Mailchimp
When a form on your site includes an email field and has Mailchimp integration enabled, each submission automatically adds the email address to your selected Mailchimp audience. To enable this on a specific form:
- Go to Forms and edit the form
- Ensure the form has a field with type Email
- Enable the Mailchimp checkbox in the form's integration settings
If the email address already exists in the audience, it is skipped without creating a duplicate.
Troubleshooting
Campaign dropdown is empty
- Verify your API key and region are correct
- Click the refresh button next to the Campaign dropdown to reload the list from Mailchimp
- Check that your Mailchimp account has at least one audience (list) created
Form submissions are not reaching Mailchimp
- Confirm the Mailchimp plugin is installed and active in Settings > Plugins
- Check that the Mailchimp checkbox is enabled on the specific form
- Verify your form has an Email field type
- Ensure a campaign is selected in the plugin settings
"The region is not reachable" error
- Verify the region matches your Mailchimp account (visible in the URL when logged into Mailchimp, e.g.,
us10.admin.mailchimp.com) - If you recently changed API keys, clear the credentials and re-enter them