How to Migrate from Mailchimp to ActiveCampaign: The Complete 2026 Guide

Export Everything from Mailchimp

Don’t rely on memory. Export every piece of data you might need, even things you think you won’t use. Once you close your Mailchimp account, this data is gone.

Contacts & audiences: Navigate to Audience → All Contacts → Export Audience. Download the CSV file. If you have multiple audiences, export each separately. The CSV includes email addresses, names, tags, subscription dates, and custom fields.

Tags & segments: While segments can’t be directly imported into ActiveCampaign, take screenshots of your segment conditions. You’ll recreate these in ActiveCampaign using their segment builder (which is far more powerful). Export any tag-based segments as separate CSVs for reference.

Email templates: Go to Campaigns → Email Templates. For custom HTML templates, click Edit → Export HTML. Save each template as a standalone HTML file. For drag-and-drop templates, take screenshots of the layouts — you’ll rebuild these in ActiveCampaign’s email designer.

Automations: This is critical. Screenshot every Customer Journey: the trigger, each email in the sequence, timing between emails, and any conditional branches. Also note which emails have the highest engagement — you’ll want to keep those copy blocks intact.

Reports & analytics: Export campaign reports (Campaigns → Reports → Export) and take screenshots of your audience growth chart, engagement metrics, and revenue attribution data. This gives you historical benchmarks to compare against after migration.

Set Up Your ActiveCampaign Account

Start your ActiveCampaign free trial before you import anything. You’ll want to configure the account structure first.

Choose your plan wisely. The Plus plan at $49/month is what we recommend for migrations. It includes the CRM (which replaces the need for a separate tool), landing pages, lead scoring, and — importantly — ActiveCampaign’s free migration service where their team handles importing contacts and rebuilding up to 3 automations, 3 templates, and 3 forms for you. The Starter plan at $15/month works if your list is small and your automations are simple.

Set up email authentication. Before sending a single email, configure your sending domain with SPF, DKIM, and DMARC records. ActiveCampaign walks you through this in Settings → Domains. This is non-negotiable — proper authentication is the foundation of deliverability, and it’s one of the reasons ActiveCampaign achieves 94.2% Gmail inbox placement in our testing.

Install site tracking. One of ActiveCampaign’s biggest advantages over Mailchimp is site tracking — a small JavaScript snippet on your website that tracks which pages each contact visits. This enables behavioral automation triggers like “send a follow-up email when someone visits the pricing page three times.” Install this during setup, not three months later, because tracking only starts from the moment the code is live.

Create your list structure. ActiveCampaign uses lists differently than Mailchimp. Keep your lists broad (e.g., “Leads,” “Customers,” “Newsletter”) and use tags and custom fields for granular segmentation. Over-creating lists is the #1 structural mistake new ActiveCampaign users make.

Import Contacts & Map Your Fields

This is where most migration guides oversimplify. “Just upload the CSV” is technically correct but misses critical details that affect your data quality and segmentation downstream.

Clean your list first. Open your Mailchimp CSV export and remove: hard bounces, unsubscribes, contacts marked as “cleaned” by Mailchimp, and anyone who hasn’t engaged in 12+ months. For a 10,000-contact list, don’t be surprised if you import only 6,000–7,000. That’s a good thing — you’re starting with a healthy, engaged audience.

Map Mailchimp fields to ActiveCampaign fields. During import, ActiveCampaign will ask you to map each column in your CSV to a contact field. Standard fields (email, first name, last name) map automatically. For custom fields (like company name, plan type, lead source), you can create new custom fields during import. Take your time here — incorrect field mapping is hard to undo at scale.

Preserve your tags. Mailchimp tags appear in your CSV export. During ActiveCampaign import, map the tags column and select “Add tag to contacts.” This ensures your segmentation logic carries over. If you had segments based on behavior (opened campaign X, clicked link Y), you’ll need to recreate those as ActiveCampaign segments using their condition builder.

Import in batches if your list is large. For lists above 10,000 contacts, consider importing in two batches: most engaged contacts first (opened/clicked in last 90 days), then the rest. This gives you a clean warm-up group for Step 6.

Rebuild Automations (Better, Not Identical)

This is the most important step in the entire migration — and the one most people get wrong. Don’t recreate your Mailchimp automations identically. You switched because Mailchimp’s automation was limited. Use ActiveCampaign’s capabilities to build better sequences than what you had.

Mailchimp’s Customer Journeys vs ActiveCampaign’s Automations: Mailchimp gives you a few trigger types, basic if/else branching, and a cap of around 6 journey starting points. ActiveCampaign gives you 135+ triggers, unlimited actions per automation, conditional splits based on virtually any contact attribute, goal tracking, and automations that can trigger other automations. It’s the difference between a flowchart and a complete programming language.

Start with your revenue-critical automations:

1. Welcome sequence — In Mailchimp this was probably a linear 3–5 email series. In ActiveCampaign, add conditional branches based on which link they click, what pages they visit (using site tracking), or which tag they carry. Deliver relevant content from day one instead of blasting the same sequence to everyone.
2. Abandoned cart / browse abandonment — If you’re running WooCommerce or Shopify, ActiveCampaign’s ecommerce integrations pull in order data, product views, and cart events. Build a flow: abandoned cart reminder (1 hour) → social proof email (24 hours) → discount offer (72 hours) with conditional exits when they purchase.
3. Lead nurturing / onboarding — Use ActiveCampaign’s lead scoring to create smart branches. High-engagement contacts get fast-tracked to sales-ready content. Low-engagement contacts get re-engagement sequences. This wasn’t possible in Mailchimp at all.
4. Re-engagement / win-back — Set up a sunset policy automation: contacts inactive for 60 days get a re-engagement series. Still inactive after 90 days? Auto-tag them as “cold” and suppress from regular sends. Your deliverability will thank you.

Recreate Forms & Landing Pages

Every Mailchimp form on your website needs to be replaced. If you skip this, new subscribers sign up to a dead Mailchimp account while your ActiveCampaign list stays stale.

Audit every form location. Check: your website header/footer, sidebar widgets, blog post footers, pop-ups, slide-ins, dedicated landing pages, and any third-party platforms (like project management tools or community platforms) where you embedded Mailchimp forms.

Build replacement forms in ActiveCampaign. The form builder in ActiveCampaign supports inline forms, floating bars, floating boxes, and modal pop-ups. Each form can be connected to a specific list, apply tags automatically, and trigger an automation on submission. If you’re on the Plus plan, you also get dedicated landing pages.

Update third-party integrations. If you connected Mailchimp to Shopify, WooCommerce, WordPress, or Make.com, switch those integrations to ActiveCampaign. ActiveCampaign has 950+ native integrations, and most popular platforms have a dedicated ActiveCampaign connector. For anything that doesn’t, Zapier or Make.com can bridge the gap.

WordPress users: If you’re using the Mailchimp for WordPress plugin, deactivate it and install ActiveCampaign’s WordPress plugin instead. This handles forms, site tracking, and WooCommerce integration in one go. If you’re on Kinsta or Cloudways, the plugin installation takes under a minute via the WordPress dashboard.

Warm Up Your Sending Domain

This is the step that separates successful migrations from deliverability disasters. When you switch email platforms, you’re sending from new IP addresses with zero sender reputation. Gmail, Outlook, and Yahoo don’t know you yet — and they’re suspicious of unfamiliar senders blasting thousands of emails.

Week 1: Send only to your most engaged contacts — people who opened or clicked an email in the last 30 days. Keep volume under 1,000 emails per day. ActiveCampaign has built-in sending limits for new accounts that help with this; don’t try to override them.

Week 2: Expand to contacts who engaged in the last 90 days. Gradually increase volume to 2,000–5,000 per day. Monitor your open rates and bounce rates in ActiveCampaign’s reporting dashboard. If open rates drop significantly, slow down.

Week 3: Include your full active list. By now, inbox providers have seen consistent, engaged sending from your new setup and your sender reputation is building. Continue monitoring for another week before turning on high-volume campaigns.

Go Live & Monitor

Once your warm-up is complete and your automations are running, you’re live on ActiveCampaign. But the migration isn’t truly “done” until you’ve verified everything works under real conditions.

Monitor for 2 weeks: Watch your open rates, click rates, bounce rates, and spam complaint rates in ActiveCampaign’s reporting dashboard. Compare these to your Mailchimp benchmarks. A slight dip in the first week is normal — your sender reputation is still maturing. If open rates are down more than 20%, check your authentication setup and slow down your sending volume.

Test every automation. Subscribe to your own list with a test email address and trigger every automation manually. Verify that emails arrive, timing is correct, conditional branches work, and tags are applied properly. Test on Gmail, Outlook, and Yahoo — rendering can differ between clients.

Verify form submissions. Fill out every form on your website and confirm that new contacts appear in ActiveCampaign with the correct tags, list assignments, and automation triggers. Check that your WordPress integration, Shopify connector, and any Make.com automations are passing data correctly.

When to close Mailchimp: Keep your Mailchimp account active for at least 2–4 weeks after going live on ActiveCampaign. Once you’ve confirmed that all data is migrated, all automations are running, and deliverability is stable, you can safely close your Mailchimp account. Download a final export first, just in case.