Automate and Filter Mailchimp Seedlist Contacts with Zapier

 

👀 Please take a look in the video with the steps if you need any help 😎

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How to Filter Mailchimp Contacts by Tag Using Zapier and Warmy?

Introduction

You can use Zapier to connect Mailchimp with Warmy and automatically manage the contacts used in your email warm-up process.

In this workflow, Mailchimp tags identify the contacts you want to use for warm-up. Zapier then rotates these contacts and increases the contact count over time based on the growth rate you configure.

Follow the steps below to set up the workflow and test it before publishing your Zap.

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Configure the Zapier Schedule

Start by setting when your automation should run.

1. Open your Zapier automation project.
2. Open Schedule by Zapier, which should be the first step in your Zap.
3. Set Time of Day to the time you want the automation to run, such as 8:00 AM.
4. Choose whether you want the Zap to Trigger on weekends.
5. Set Timezone Override if you want the schedule to use a specific timezone, such as Europe/Berlin.
6. Click Continue.

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Open the JavaScript Code Step

Next, open the step that handles the contact rotation.

1. Find Code by Zapier in your Zap.
2. Click the three dots icon to open More Options.
3. Open the Run JavaScript configuration.
4. You should see the Input Data panel on the left and the JavaScript editor on the right.

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Check the Warm-Up Tag in the Code

The JavaScript uses a tag to identify the Mailchimp contacts that should be included in the warm-up process.

1. In the code editor, find the WARMUP_TAG variable.
2. It may look similar to: const WARMUP_TAG = "warmupsplit20270";
3. Keep this value in mind. You will replace it with the exact Mailchimp tag you create in the next steps.

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Create a Warm-Up Tag in Mailchimp

Now create the tag that will identify your warm-up contacts.

1. Open Mailchimp in a new browser tab.
2. Go to Audience > Tags.
3. Click Create new tag.
4. When the What should we name this tag? window appears, enter a name for your tag.
For example, enter Warmup20270Seedlist.
5. Click Create.
6. Mailchimp should display a confirmation that the tag was successfully created.

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Add the Mailchimp Tag to the Zapier Code

Return to Zapier and connect the code to the tag you just created.

1. Switch back to the Code by Zapier step.
2. Find the WARMUP_TAG variable.
3. Replace its value with the exact name of your Mailchimp tag.

For example: const WARMUP_TAG = "Warmup20270Seedlist";

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Create a Mailchimp Segment for the Tag

Create a segment so Mailchimp can filter contacts based on your warm-up tag.

1. Return to Mailchimp.
2. Go to Audience > Segments.
3. Click Create segment.
4. In the Segment Builder, find How your contacts are tagged.
5. Click the + icon next to this option.
6. Select Tags from the filter menu.
7. Open Select or search a tag.
8. Search for and select your warm-up tag, such as Warmup20270Seedlist.

9. The filter should now look similar to: Tags is any of Warmup20270Seedlist
10. Click Use segment.

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Name and Save the Segment

Save the segment so you can easily identify it later.

1. When the Name your segment window appears, enter a descriptive name.
2. For example, use WarmupWithSeedlist20270.
3. Click Save & exit.
4. Mailchimp will confirm that your segment is building.
5. The segment will then appear in your saved segments.

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Configure the Warmy and Mailchimp API Keys

Return to the Run JavaScript step in Zapier and configure the required input values.
In the Input Data panel, locate these fields:

• warmy_api_key
• warmy_holder_uid
• mailchimp_api_key
• audience_id
• split_id
• initial_count

For the API keys, use Zapier Global Variables instead of entering the keys directly into the code step.

To configure warmy_api_key:

1. Click the field mapping icon next to warmy_api_key.
2. Open the Variables tab.
3. Under Global, select WarmAPIKey.
4. Close the Variables menu.

Repeat the same process for mailchimp_api_key:

1. Open the field mapping menu.
2. Select Variables > Global.
3. Choose MailChimpAPIKey.

For audience_id, select:

Variables > Global > AudienceID

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Get the Warmy Holder UID

The workflow also requires the Warmy Holder UID.

1. Open the Warmy API documentation in a new browser tab.
2. Go to the Users Splits section.
3. Find the Holder UID parameter.
4. Copy the provided value.
5. Return to Zapier.
6. Enter the value in the warmy_holder_uid field.

If you already have the value saved as a Global Variable, you can map it from there instead.

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Find Your Mailchimp Audience ID

The workflow also needs the ID of the Mailchimp audience that contains your contacts.

1. Open the Mailchimp API documentation.
2. Go to Lists/Audiences.
3. Select Get lists info.
4. Change the code sample language to Python if you want to view the developer-ready example.
5. Review the API endpoint and example response.
6. Find the audience/list that you want to use.
7. Copy its ID.
8. Return to Zapier and enter it in the audience_id field.

If you have already stored the ID as a Global Variable, you can map AudienceID instead.

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Configure the Split and Contact Growth

Set the values that control the contact rotation and growth.

1. In the Input Data panel, find split_id.
2. Enter your Warmy split ID, such as 20270.
3. Find initial_count.
4. Enter the starting number of contacts, such as 30.
5. In the JavaScript editor, find the growthRate variable.
6. Set the growth rate you want to use.

For example: growthRate = 0.04
This applies a 4% growth rate.

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Run the Code to Test the Workflow

Before publishing the Zap, run the code and check the results.

1. Click Run Code at the top of the code editor.
2. Wait for the code to finish.
3. Review the Output Data panel.
4. Check the following values:
       • Removed — contacts removed during the rotation.
       • Added — contacts added during the rotation.
       • New Count — total contacts after the rotation.
       • Growth Rate Applied — growth percentage applied to the contact list.
5. Review the runtime information and logs for any errors.

The output gives you a quick way to confirm that the rotation worked as expected.

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Verify the Contacts in Mailchimp

After the test finishes, verify the result in Mailchimp.

1. Return to Mailchimp.
2. Go to Audience > Tags.
3. Find your warm-up tag.
4. Click View next to the tag.
5. The Contacts page will show the contacts assigned to that tag.
6. Compare the contact count with the New Count shown in Zapier.

For example, if Zapier reports a new count of 31, Mailchimp should show the corresponding number of contacts with that tag.

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Test the Rotation Again

Run the code one more time to make sure the rotation and growth process continues to work.

1. Return to the Code by Zapier step.
2. Click Run Code again.
3. Wait for the execution to finish.
4. Review the updated Output Data.
5.Check the new contact counts and growth rate.

This second test helps confirm that the workflow can rotate contacts and increase the list over multiple runs.

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Filter Mailchimp Contacts by the Warm-Up Tag

You can also verify the tag directly from the Mailchimp Contacts page.

1. Go to Audience > Contacts.
2. If another tag filter is active, click Clear.
3. Open the Tags filter.
4. Select the checkbox next to your warm-up tag.
5. Mailchimp will update the contact list to show only contacts with that tag.

For example, the filtered list may show 33 contacts after the second rotation.

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Enable Extended Runtime for Large Audiences

If you're working with a large number of contacts, give the Zap enough time to finish processing them.

1. Return to the Zapier workflow editor.
2. Find the Runtime section in the left navigation panel.
3. Expand the Extended runtime options.
4. Select a longer runtime, such as 8 minutes — Up to 10 additional tasks.

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Review the Configuration and Publish the Zap

Before activating the automation, review all of your settings.
Make sure the following values are configured:

Field	Configuration
warmy_api_key	WarmAPIKey Global Variable
warmy_holder_uid	Warmy Holder UID
mailchimp_api_key	MailChimpAPIKey Global Variable
audience_id	Your Mailchimp audience/list ID
split_id	Your Warmy split ID
initial_count	Starting contact count
WARMUP_TAG	Exact Mailchimp tag name

Also confirm that the tag name in your JavaScript code exactly matches the tag you created in Mailchimp.

When everything looks correct:

1. Click Publish in Zapier.
2. Your Zap will become active.
3. The workflow will run according to the schedule you configured.
4. During each run, the automation will rotate the warm-up contacts and apply the configured growth rate.

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Expected Result

Your Zapier automation is now configured to run your Mailchimp and Warmy contact workflow automatically.

At the scheduled time, the Zap can:

1. Identify contacts using your Mailchimp warm-up tag.
2. Rotate contacts through the warm-up process.
3. Increase the contact count according to your growth rate.
4. Update the Mailchimp contact list.
5. Repeat the process automatically each day.

Your Mailchimp tag and segment should remain available so you can easily identify and filter the contacts used for your warm-up workflow.

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 How to Automate Seed List Email Sync Between Mailchimp, Zapier, and Warmy

Introduction

You can connect Mailchimp and Warmy through Zapier to automatically sync seed list contacts and keep your Mailchimp audience updated.

This workflow uses Mailchimp tags and segments to organize contacts, while Zapier processes contact updates and Warmy webhooks send seed list notifications. Once configured, the workflow can automatically add and remove contacts as seed list events occur.

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Open the Mailchimp Tags Section

Start by creating the tags that will identify the contacts used by the automation.

1. Log in to Mailchimp.
2. Open the Audience dashboard.
3. Click Tags in the left navigation menu.

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Create a Tag for Seed List Emails

Create a tag that will identify your seed list contacts.

1. Click Create New Tag or Create tag.
2. When Mailchimp asks What do you want to name this tag?, enter a descriptive name.
3. For example, use seedlist_mss_00279.
4. Click Create.

The tag is now available in your audience and can be used to identify seed list contacts.

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Create a Tag for Contacts to Remove

Create a second tag for contacts that need to be removed later.

1. Return to the Tags page.
2. Click Create New Tag again.
3. Enter a name for the contacts-to-remove tag.
4. Click Create.

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 Open the Mailchimp Segments Section

Next, create segments based on the tags you just created.

1. In Mailchimp, open Segments from the left navigation menu.
2. Click Create Segment.

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Create a Segment for Seed List Contacts

Create a segment that contains contacts with your seed list tag.

1. In the Segment Builder, open the conditions dropdown.
2. Select Tags.
3. Click Select or search a tag.
4. Select the seed list tag you created earlier.
5. Apply the filter.
6. Enter a descriptive name for the segment.
7. Click Save and Exit.

You can now use this segment to identify your seed list contacts.

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Create a Segment for Contacts to Remove

Create another segment for contacts that should be removed from the workflow.

1. Click Create Segment again.
2. Select Tags as the filter.
3. Choose the remove tag you created earlier.
4. Give the segment a descriptive name, such as Contacts to Remove.
5. Click Save and Exit.

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Open Warmy

Now create the API key that Zapier will use to communicate with Warmy.

1. Open Warmy in a new browser tab.
2. Log in to your Warmy dashboard.
3. Open the API Keys section.

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Create a Warmy API Key

Generate an API key for the Zapier integration.

1. Click Add API Key or Create Key.
2. Enter a clear name for the API key.
3. Click Create Key.
4. Copy the generated API key and save it somewhere secure.

You will use this key when configuring your Zapier variables.

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Find the Warmy Holder ID

The workflow also requires the Warmy Holder ID.

1. Open the Warmy API documentation.
2. Find the Warmy Holder ID parameter.
3. Copy the value provided in the documentation.

The Holder ID is a static value and is the same for all users.

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Open Your Zapier Workflow

Return to Zapier and open the Zap you will use for the seed list synchronization.

1. Open your existing Zap or create the workflow.
2. Open Manage Variables.
3. Configure the values required by the workflow as global variables.

Add the following variables:

• Warmy API Key — the API key created in Warmy.
• Warmy Holder ID — the static value from the Warmy API documentation.
• Mailchimp Audience ID — the ID of your Mailchimp audience.
• Email Address / User ID — the value provided by the send emails webhook step.

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Get Your Mailchimp Audience ID

The Mailchimp Audience ID is not available directly in the Mailchimp interface.
You need to retrieve it using the Mailchimp API.

1. Open the Mailchimp API.
2. Use a request that retrieves your audiences or lists.
3. Review the response.
4. Find the ID of the audience you want to use.
5. Save this ID as a Zapier global variable.

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Configure the Zapier Webhook

Now configure the webhook that will receive information from the workflow.

1. In your Zap, locate the Webhook by Zapier trigger step.
2. Add the required event type.
3. Configure the webhook to extract the following values from the incoming data:
    • ID
    • Removed emails
    • Balanced emails
4. Copy the Webhook URL generated by Zapier.

You will use this URL in both the Zapier code and Warmy notification settings.

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Add the Webhook URL to the Code

Use the webhook URL in your JavaScript code.

1. Paste the Zapier webhook URL into the appropriate field.
2. Open the Code by Zapier step.
3. Add the webhook URL to the code.
4. Click Run to execute the code once.

This test allows Zapier to receive and process the webhook data.

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Select a Record From the Test Run

After the webhook has been triggered, select a sample record.

1. Click Select record from running or Select Record from Listing.
2. Review the available test records.
3. Select the appropriate record.
4. Click Continue with selected record.

Zapier will use the selected record as the sample data for the workflow.

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Increase the Code Runtime

The workflow may need several minutes to process contacts.

1. Open the settings for the Code by Zapier step.
2. Find the Runtime setting.
3. Increase the runtime to approximately 4–8 minutes.

This gives the code enough time to process the contacts without stopping early.

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Run the Full Code Step

Test the complete code workflow.

1. Click Run in the Code step.
2. Wait for the process to finish.
3. Confirm that the execution completes successfully.

A successful execution should show: Process finished with exit code 0

If you see an error instead, review the code, variables, webhook data, and API configuration before continuing. Verify the Mailchimp Sync

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Check the Seed List Tag

Verify that the synchronization added contacts to Mailchimp.

1. Return to Mailchimp.
2. Open Tags.
3. Select the tag you created for seed list emails.
4. Check the contacts associated with the tag.

You should see new contacts added by the synchronization.

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Check the Seed List Segment

Confirm that the new contacts eventually appear in the segment.

1. Open Segments in Mailchimp.
2. Select the seed list segment you created earlier.
Review the contacts in the segment.

If the segment initially shows No contacts match this selection, don't worry. The contacts may appear after Mailchimp finishes processing the tag changes. Test Contact Updates

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Run Another Zapier Test

Next, test how the workflow handles contact updates.

1. Return to Zapier.
2. Run another test for the contacts that were synchronized.
3. Wait for the process to complete.

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Run the Update Code

Run the Code step again to process the update.

1. Open the Code by Zapier step.
2. Click Run.
3. Wait for the code to finish.

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Trigger the Webhook for the Update

Trigger the webhook so Zapier can process the updated data.

1. Open the Webhook step.
2. Select New Test Raw or Test Raw Request.
3. Run the code for the update.

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Verify the Contacts to Remove

Check whether the updated contacts were added to your removal segment.

1. Return to Mailchimp.
2. Open Segments.
3. Select the Contacts to Remove segment.
4. Verify that the expected contacts are listed.

The contacts that were marked for removal should now appear in this segment.
Configure Warmy Webhook Notifications

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Open the Warmy Notifications Hub

The final part of the setup is connecting Warmy to the Zapier webhook.

1. Return to Warmy.
2. Open the Notifications Hub or notification settings.

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Enable Webhook Notifications

Enable the webhook notification option.

1. Find Webhook in the available notification options.
2. Turn the webhook notification on.

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Add the Zapier Webhook URL

Connect Warmy to the webhook you created in Zapier.

1. Find the webhook URL field in Warmy.
2. Paste the Zapier Webhook URL you copied earlier.
3. Make sure the URL is complete and correct.

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Save and Verify the Notification Settings

Finish the webhook configuration.

1. Click Save.
2. Confirm that Seed List Notifications are available and enabled.

Warmy can now send seed list notifications to your Zapier webhook when the configured events occur.

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Expected Result

Your Mailchimp, Zapier, and Warmy workflow is now connected.
When the configured seed list events occur:

• Mailchimp tags identify the relevant contacts.
• Mailchimp segments organize those contacts.
• Zapier receives webhook data and processes the contact changes.
• Warmy sends seed list notifications to the Zapier webhook.
• Contacts can be added to the appropriate Mailchimp tags and segments.
• Contacts marked for removal can be identified through the Contacts to Remove segment.

The automation is now ready to synchronize seed list contacts between Warmy and Mailchimp through Zapier.