How to connect multiple Mailchimp accounts to Claude

Claude's built-in Mailchimp connector works well if you use one Mailchimp account. But when you connect a second account, it replaces the first.

If you manage separate Mailchimp accounts for different products, regions, or business units, that quickly becomes frustrating.

Composio fixes this by keeping each Mailchimp account separate and giving it a simple name, such as mailchimp-1, mailchimp-2, or mailchimp-3. Claude can then use the right Mailchimp account when you mention that name.

• One Composio connector in Claude
• Two or more Mailchimp accounts connected behind it
• A clear name for each account
• The ability to work in the right Mailchimp account from a single Claude chat

For example:

Search my mailchimp-1 and mailchimp-2 Mailchimp accounts for anything that needs my attention from the last 7 days. Tell me which account each item came from.

Using the mailchimp-1 account, create a new email campaign for subscribers.

• A Claude account
• A free Composio account
• Access to each Mailchimp account you want to connect

If you use Claude Free, you can have one custom connector. If you already use that slot, you will need to remove the existing custom connector first.

If you use Claude Team or Enterprise, an Owner may need to add the connector for the organisation. Each member can then connect their own accounts.

Step 1: Add Composio to Claude (one-time process)

1. Click the button below. This will take you to the Claude Custom Connector modal.

Add to Claude

2. Click Continue

3. In the next modal, click Add

4. It will take you to the authentication page. Sign in to Composio and approve the connection.

Then return to Claude and make sure Composio is enabled.

Step 2: Connect your first Mailchimp account

In a new Claude chat, type:

Connect my mailchimp-1 Mailchimp account to Composio. Call it mailchimp-1.

Claude will give you a sign-in link.

1. Click the link.
2. Sign in to your mailchimp-1 Mailchimp account.
3. Review and approve Mailchimp's permission request.
4. Return to Claude.

Claude should confirm that the account is connected.

The name mailchimp-1 is how Claude knows which Mailchimp account to use. Choose short, obvious names. Good examples include:

• mailchimp-1
• mailchimp-2
• mailchimp-3

Step 3: Connect your second Mailchimp account

In the same Claude chat, type:

Connect another Mailchimp account. Call it mailchimp-2.

Claude will give you a new sign-in link.

1. Open the link.
2. Sign in to the second Mailchimp account.
3. Review and approve Mailchimp's permission request.
4. Return to Claude.

Claude should confirm that mailchimp-2 is connected.

Important: Check that Mailchimp is showing the second account before you approve access. If the wrong account appears, sign out or open the link in an incognito or private window.

Repeat this step for every other Mailchimp account you want to add. Give each connection a short, descriptive name such as mailchimp-1, mailchimp-2, mailchimp-3, or client-acme.

Step 4: Check your connected Mailchimp accounts

Ask Claude:

List my connected Mailchimp accounts in Composio. Show each account's name and connection status.

You should see every account you added, and each connection should show as ACTIVE.

For an extra check, ask:

Show the account email or ID and the account name for each connected Mailchimp account.

This helps you confirm that every label points to the correct Mailchimp account and that you did not connect the same account twice.

Step 5: Use the right Mailchimp account

Mention the account name whenever you ask Claude to work with Mailchimp. This is especially important when an action could change data.

Review activity across accounts

Check mailchimp-1 and mailchimp-2 for anything new in Mailchimp from the last 14 days. Group the results by account.

Add a new customer to my Mailchimp store

Using the mailchimp-1 account, add a new customer to my Mailchimp store.

Set up a webhook for batch processing updates

Using the mailchimp-2 account, set up a webhook for batch processing updates.

Find something across accounts

Search all connected Mailchimp accounts for customer@example.com. Show which account it appears in and summarise the latest activity.

For actions such as creating, changing, or deleting data, ask Claude to show you the planned action first and wait for your confirmation.

Add this to your Claude preferences or project instructions, replacing the examples with your own account names:

My Mailchimp accounts are: mailchimp-1 = my main account, mailchimp-2 = my second account, and mailchimp-3 = a client account. Always use the named account when I specify one. If I do not name an account, ask me which one to use. Before creating, changing, or deleting anything, show me the planned action and wait for confirmation.

If Claude's built-in Mailchimp connector is also enabled, Claude may use it instead of Composio. For a clearer setup, turn off the built-in connector or explicitly tell Claude to use Mailchimp through Composio.

The chat method is the quickest way to connect accounts. Use the dashboard when you want to add, rename, reconnect, or remove a connection.

1. Go to dashboard.composio.dev.

2. Sign in with the same Composio account you connected to Claude.
3. Open For You from the product switcher.
4. Find Mailchimp.
5. Click Connect and complete the Mailchimp authorisation flow.
6. Click Connect again to add another Mailchimp account. Composio keeps it as a separate connection instead of replacing the first.
7. Give each connection a clear label, such as mailchimp-1, mailchimp-2, or mailchimp-3.

If Mailchimp opens the wrong account during authorisation, sign out first or use an incognito or private window.

From the dashboard, you can also:

• Rename a connection when a default label such as mailchimp-2 is no longer useful.
• Disconnect or delete an account you no longer want Claude to access.
• Re-authorise an expired or revoked connection.