Use Mailchimp with Squarespace

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Use Mailchimp with Squarespace

Last updated October 19, 2026 18:03

Grow your subscriber list, send newsletters, and sync your online store with Mailchimp.

Mailchimp is a third-party email marketing service you can use to design and send email campaigns and newsletters. You can use Mailchimp with your Squarespace site in many ways, from collecting email addresses on your pages to syncing your store data.

The Mailchimp integration and extension, are available in the Core, Plus, Advanced, and some legacy plans. Commerce Basic, and Commerce Advanced plans.

Explore Squarespace Email campaigns

Email Campaigns is our powerful built in email marketing platform that connects to your site. You can turn blog posts into newsletters, promote your products, and create a design that matches your site. You can also build mailing lists and send automated and blast emails to your audience.

Video on how to use Mailchimp with your site

Watch a two-minute video for an overview of how the Mailchimp integration works with your site. It covers connecting your account and collecting subscribers.

Connect forms to Mailchimp

Use Mailchimp as a storage option in the form block and the newsletter block. This adds form submissions to an audience (formerly called a list) in your Mailchimp account. Review the requirements before you connect, because some Mailchimp settings prevent submissions from collecting.

Connect a form or newsletter block to a Mailchimp audience

Connect the block to mailchimp in the block's Storage tab. If you're setting up a new audience for this block, create it in Mailchimp first.

  1. Click Storage in the block editor, then click Connect next to Mailchimp.
  2. Log into Mailchimp.
  3. Select a Mailchimp audience for form submissions.

Remove required fields from your Mailchimp audience

If any fields other than Email are required in your Mailchimp audience settings, form submissions won't collect in Mailchimp. Make the fields optional in Mailchimp. You can then create required fields using the form or newsletter block settings in Squarespace.

Use a new, empty audience

To use Mailchimp as a storage option, we recommend connecting to a new, empty Mailchimp audience. To connect multiple form or newsletter blocks to the same Mailchimp audience, keep the form fields and settings exactly the same between the blocks. Any differences can cause Mailchimp to drop or reject form submissions.

Don’t edit form fields after connecting

If your form block fields and Mailchimp audience fields don't match, submissions may not pass to Mailchimp. To avoid this, finish your form fields before you connect the block. If you edit any form fields after connecting to Mailchimp, create and link a new Mailchimp audience.

Keep your Mailchimp audience under 30 data fields

Mailchimp audiences can't have more than 30 data fields. If the form block has more than 30 form fields, edit the form block and remove some fields. Count your fields before connecting so Mailchimp doesn't reject submissions later.

Keep field values under 225 characters

Mailchimp limits audience field values to 255 characters. If you expect to go over that limit, we recommend connecting another storage option. Long-answer fields, like message or comment fields, are the most likely to pass the limit.

Connect other forms to Mailchimp

These forms have the same Mailchimp storage options as the form and newsletter blocks:

Turn your blog into an email newsletter

You can use Mailchimp's RSS-to-Email campaign feature to automatically email subscribers when you add new content to your RSS feed. The email includes a summary of your blog post with images and post text or excerpts.

Sync your Commerce store with Mailchimp

Send details from your Squarespace store to Mailchimp.

What does the Mailchimp extension sync?

Sync your Squarespace products, orders, and customer information to your Mailchimp account by connecting the Mailchimp extension. This extension is ideal if you sell products on Squarespace and use Mailchimp for email marketing. You connect it from the Squarespace Extensions marketplace rather than from an individual block.

Get support for the Mailchimp extension

We work with third-party services to ensure Squarespace Extensions work, but we don't support extensions. We can help with connecting or disconnecting your extensions. For all other questions, contact the extensions provider or visit Mailchimp's guides.

Use double opt-in to confirm subscriptions

Double opt-in asks subscribers to confirm before they're added to a list.

Note: This guide is a resource, but it's not legal advice. Squarespace doesn't give advice on laws applicable to your site or business, as stated in our Terms of Service.

How does double opt-in work?

Mailchimp's double opt-in process asks visitors to confirm their audience subscriptions by email. After they confirm, Mailchimp adds their contact information to your audience.

Double opt-in is on by default

Double opt-in is on by default for all forms that connect to Mailchimp. It helps you reduce spam and ensures the people on your list are interested in your content. If you live in the EU, you might want to keep this setting checked to comply with local regulations.

Turn off double opt-in

You can turn double opt-in off for one form or newsletter block. Mailchimp then adds subscribers to your audience without an email confirmation. Repeat these steps for each block you want to change.

  1. Open the form's editor.
  2. For form and newsletter blocks, click the Storage tab, then click Mailchimp.
  3. Switch the Require double opt-in toggle off.

Connect multiple blocks to Mailchimp

Connecting multiple forms to a single Mailchimp audience can cause several issues, including dropped form submission data and blocks disconnecting from Mailchimp. We recommend using a separate Mailchimp audience for each form or newsletter block on your site when possible. Create the extra audiences in Mailchimp before you connect your blocks.

Fix issues with multiple blocks connected to one audience

If you connect multiple blocks to a single Mailchimp audience, each block needs to be exactly the same. Any differences in the type, name, or order of fields between blocks create errors. Follow these steps to reset the connection and match your blocks:

  1. Reset the Mailchimp connection for each block.
  2. Check each block to confirm all fields are the same.
  3. Reconnect Mailchimp in the Storage tab.

Can I connect multiple Mailchimp accounts?

You can connect only one Mailchimp audience to each block's storage, but you can connect more than one Mailchimp account to different forms on your site. For example, one newsletter block can connect to an audience in one Mailchimp account, and another newsletter block can connect to an audience in a different Mailchimp account. This doesn't cause conflicts the way connecting to the same audience does because each form's storage works on its own.

Authenticate your custom domain in Mailchimp

Authenticate your domain in Mailchimp so your email campaigns are less likely to be marked as spam. If you don’t authenticate, Mailchimp may not add new subscribers to your audience. To authenticate your domain, you'll add two CNAME records in your domain’s DNS settings, then finish the process in Mailchimp.

Step 1 - Add two CNAME records to your Squarespace DNS settings

To authenticate your Squarespace domain, open your DNS settings and create the two custom CNAME records. Enter the values exactly as they appear below. The two records are almost identical, but they are different. Don't use Mailchimp's recommended host value, because the authentication will fail.

First CNAME record:

  • Choose CNAME from the Type drop-down
  • In the Host field, enter k2._domainkey (Don't use Mailchimp's recommended CNAME, k2._domainkey.example.com, as the authentication will fail)
  • In the Data field, enter dkim2.mcsv.net

Second CNAME record:

  • Choose CNAME from the Type drop-down
  • In the Host field, enter k3._domainkey (Don't use Mailchimp's recommended CNAME, k3._domainkey.example.com, as the authentication will fail)
  • In the Data field, enter dkim3.mcsv.net

Step 2 - Complete the authentication process in Mailchimp

Using the records you created in Squarespace, follow Mailchimp's documentation to complete the authentication process. Keep in mind, it can take some time for new CNAME records to propagate, so Mailchimp may not be able to authenticate immediately. If authentication fails right away, wait and try again before you edit your records.

Authenticate a third-party domain

To authenticate a third-party domain, add Mailchimp’s CNAME records wherever you manage your DNS settings. If you need help, contact your domain provider.

Measure site traffic from Mailchimp

Traffic sources analytics shows where visitors come from on the web. When using Mailchimp for marketing, you can learn how many visitors Mailchimp brings in through campaigns and forms, and how sources compare.

Keep in mind, traffic analytics shows visitors any Mailchimp campaign sends to your site, not only yours. For example, if a friend promotes your site in their own Mailchimp campaign, traffic sources analytics records visitors who clicked through that campaign to your site, too.

Connect a cover page form (version 7.0 only)

To build a mailing list on a cover page, add a form in the action panel and connect it to Mailchimp. Cover page forms use the same Mailchimp storage options as form and newsletter blocks.

Troubleshoot Mailchimp issues

If your form submissions aren't reaching Mailchimp, or a block disconnects from your account, start by checking your audience's required fields and field limits. Most connection problems come from a mismatch between your form fields and your Mailchimp audience fields. If this doesn't help, troubleshoot the issue.

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Use Mailchimp with Squarespace