Klaviyo Migration Playbook from Mailchimp

28 May

Most eCommerce brands I see moving from Mailchimp to Klaviyo make the same mistake. They treat it like moving house. They just pack up their boxes (lists, campaigns, automations) and unpack them in the new place.

This is a huge waste.

A Klaviyo migration isn’t about moving. It’s about upgrading from a suburban townhouse to a purpose-built factory. You don’t bring your old, inefficient junk with you. You use the opportunity to build a revenue-generating machine from the ground up.

I’ve overseen dozens of these migrations, both for my own brands and for clients at Elite Brands. The difference between a simple “lift and shift” and a strategic migration is easily a 30% lift in email-attributed revenue within six months.

This is our playbook for getting it right.

Strategic planning for your Klaviyo migration

Before you export a single contact, you need a plan. A migration without a strategy is just creating the same problems in a more expensive tool. The goal isn’t just to be on Klaviyo. It’s to be profitable with Klaviyo.

This planning phase is the most important part of the entire process. It’s where you decide what the new factory will produce and how it will operate. Skipping this is like building without a blueprint.

Defining your migration goals and KPIs

First, what does success look like? Be specific. “More sales” isn’t a goal.

A good goal is measurable. For example: * Increase revenue per recipient from $0.15 to $0.25 within 90 days. * Lift welcome series open rates from 22% to over 40%. * Achieve a 15% email-attributed revenue share, up from 8% on Mailchimp.

These are real numbers we set with clients. They force you to think about what Klaviyo’s features will actually do for your business. The advanced segmentation and flow capabilities should directly impact these metrics. If they don’t, something is wrong with the strategy.

Set targets that are ambitious but realistic. This isn’t just an administrative task. It’s a strategic project with a clear ROI. The entire migration should be measured against these KPIs.

Auditing your existing Mailchimp setup

Now, look at what you have in Mailchimp. You need to be ruthless here. Most brands have years of clutter: old lists, dead segments, and automations that haven’t been touched since 2019.

We conduct a full audit as part of our process. We look at every single asset: * Lists and Audiences: Are they clean? Who are your engaged subscribers? Who hasn’t opened an email in 180 days? * Segments: Which segments actually drive revenue? Which are just taking up space? * Automations: What’s working? Your welcome series might be okay, but is the post-purchase flow doing anything? Map out every trigger and email. * Campaigns: Look at the last 12 months. What were your top 5 campaigns by revenue? What were the duds? You’re looking for patterns in what your audience responds to. * Integrations: What other tools are connected to Mailchimp? Make a list and check for Klaviyo equivalents.

The goal is to identify what’s valuable and what’s dead weight. You only want to bring the high-performing concepts and clean data across to your new Klaviyo account. Everything else gets left behind.

Data cleansing and export from Mailchimp to Klaviyo

Your email list is your most valuable asset. Moving it incorrectly can cripple your deliverability and kill your sender reputation before you even start. This stage is all about data integrity.

Garbage in, garbage out. If you import a messy, unengaged list from Mailchimp, you’ll get messy, unengaged results in Klaviyo. You’ll also pay Klaviyo to house contacts who will never buy from you.

The critical role of data hygiene

Clean data is everything in email marketing. It directly impacts your ability to land in the inbox. High bounce rates and low engagement tell Gmail, Outlook, and others that you’re sending unwanted mail.

Before you export anything, you need to clean your list in Mailchimp. Identify subscribers who haven’t engaged in a long time. A good starting point is anyone who hasn’t opened or clicked an email in the last 120-180 days.

Don’t just delete them. First, try to re-engage them with a final campaign. If they still don’t respond, then you can suppress them. This single step can improve your initial open rates in Klaviyo by 5-10 points. It shows inbox providers you’re a responsible sender from day one.

When we take on a new account, this is one of the first things we do. For one client in the fashion space, we suppressed 35% of their “active” Mailchimp list. Their open rate on the first Klaviyo campaign was 38%, up from an average of 19% in Mailchimp. If you’re unsure about the health of your current email list, a free Klaviyo audit can help identify areas for improvement before migration.

Exporting and importing your Mailchimp audience

Once your list is clean, it’s time to move the data. This needs to be done carefully to preserve important information.

Your export from Mailchimp should include: * All active, engaged subscribers. * Custom fields (like birthday, gender, or product preferences). * Consent status and the date they subscribed. This is critical for compliance.

When you import into Klaviyo, you’re not just uploading a CSV. You’re mapping the old data structure to Klaviyo’s more powerful model. Mailchimp fields become Klaviyo custom properties. This allows for much deeper segmentation later. You can find detailed instructions on Klaviyo’s help centre for this process.

A key step is to manage your suppression list. Any contacts who were unsubscribed or suppressed in Mailchimp must be added to your Klaviyo suppression list before you import your main list. This prevents you from accidentally emailing people who have opted out, which can cause serious compliance and deliverability issues. This is where creating powerful Klaviyo segments from clean, well-mapped data begins.

Flow and campaign recreation in Klaviyo

This is where you start building the machine. Don’t just copy your Mailchimp automations. Rethink them. Klaviyo’s flow builder is far more sophisticated, allowing for complex branching logic based on customer behaviour.

This is your chance to move from basic automations to truly personalised customer journeys. The brands we work with at Elite Brands see the biggest revenue gains from optimising these core flows.

Rebuilding essential automated flows

Start with the money-makers. We always build these four flows first, as they have the highest ROI. 1. Welcome Series: This is your first impression. In Klaviyo, you can create different paths for customers based on how they signed up or if they’ve purchased before. A powerful Klaviyo Welcome Flow should convert at least 5% of recipients. 2. Abandoned Cart: Go beyond a single reminder. A three-email flow is standard. Use dynamic content to show the exact products they left behind. Add splits based on cart value. A cart over $200 might get a different offer than a cart under $50. 3. Browse Abandonment: This targets window shoppers. If a known user views a product but doesn’t add it to their cart, you can follow up. This is a flow that Mailchimp struggles to do well but is native to Klaviyo. 4. Post-Purchase: Don’t stop the conversation after the sale. Use this flow to ask for a review, cross-sell related products, and educate the customer on how to use their new item.

For each flow, map out the logic on paper first. What’s the trigger? What are the splits? What’s the goal of each email? This is an architecture job, not just a writing job.

Using Klaviyo’s advanced segmentation and dynamic content

This is what you’re paying for. Klaviyo’s real power is its deep integration with your eCommerce platform, like Shopify. It knows who your customers are, what they’ve bought, how often they buy, and what they’ve looked at.

Use this data. Instead of one generic campaign, you can send three different versions tailored to specific segments: * VIPs: Your top 10% of customers get an exclusive early-access offer. * Recent First-Time Buyers: They get a campaign focused on a related product category. * Lapsing Customers: They get a stronger discount to win them back.

We saw one client increase their campaign revenue by 45% just by splitting their main weekly newsletter into three of these segments. The content was 80% the same, but the hero banner and the primary offer were personalised.

Also, use dynamic content blocks. You can show different content within the same email based on the recipient’s properties. For example, a pet store could show dog products to dog owners and cat products to cat owners in the exact same campaign. This level of personalisation is difficult in Mailchimp but simple in Klaviyo.

Testing, launch, and post-migration optimisation

The factory is built. Now you need to run quality control before opening the doors. A rushed launch can undo all your hard strategic work. Problems with DNS records or broken triggers can kill your deliverability and revenue on day one.

This phase is about a smooth transition and setting yourself up for continuous improvement.

Pre-launch testing and technical setup

Before you switch off Mailchimp, you need to test everything in Klaviyo. * Forms: Do your signup forms work? Do they add people to the correct list and trigger the welcome flow? * Flows: Test every trigger and every branch. Place a test order to check the post-purchase flow. Abandon a cart to check that flow. * Segments: Do your segments populate correctly? Check the logic to ensure the right people are being included. * Integrations: Is your Shopify or other eCommerce platform data flowing correctly? Check that key events like ‘Placed Order’ and ‘Viewed Product’ are being tracked.

The most critical technical step is setting up your sending infrastructure. This involves updating your DNS records with SPF and DKIM. These records prove to email providers that Klaviyo has permission to send emails on your behalf. According to Google’s sender guidelines, this is a fundamental requirement for good deliverability.

Getting this wrong means your emails go straight to spam. We also recommend setting up a branded sending domain (a CNAME record) to further improve your sender reputation. Strong Klaviyo deliverability is built on this technical foundation.

Post-migration monitoring and ongoing optimisation

Once you go live, the work isn’t over. The first few weeks are crucial for building your new sender reputation. This is called IP warming. You should start by sending to your most engaged segments first, then gradually expand to your wider list over two to four weeks.

Watch your metrics like a hawk. * Open rates * Click-through rates * Conversion rates * Bounce rates * Unsubscribe rates

If you see any red flags, like a high bounce rate or low open rate, you need to act immediately. It could be a technical issue or a problem with the list segment you’re mailing.

Once you have a stable baseline, it’s time to optimise. A/B testing should be part of your weekly routine. Test subject lines, email content, send times, and flow logic. Klaviyo’s A/B testing tools are built-in and easy to use. A culture of continuous improvement is what separates brands that get a 10% lift from those who get a 50% lift from their migration.

The Elite Brands checklist for your Klaviyo migration playbook

Migrating from Mailchimp to Klaviyo is a major project. Done right, it’s one of the highest-ROI activities an eCommerce brand can undertake. We’ve seen it transform the email channel from a simple newsletter tool into a primary revenue driver.

This playbook breaks down a complex process into manageable stages. It’s the same framework we’ve used to migrate over 50 eCommerce brands to Klaviyo.

Key actions for a successful Klaviyo migration

Here’s a summary of the essential steps. Don’t skip any.

Phase 1: Strategy & Planning
- Define clear, measurable KPIs for success (e.g., revenue per recipient, attributed revenue %).
- Conduct a full audit of your Mailchimp account.
- Identify and map key customer segments and journey touchpoints.
Phase 2: Data & Preparation
- Clean your Mailchimp list. Suppress unengaged contacts.
- Export all active contacts with their custom fields and consent data.
- Import your suppression list to Klaviyo first, then your main list, mapping fields correctly.
Phase 3: Build & Create
- Rebuild, don’t just copy, your core flows: Welcome, Abandoned Cart, Browse Abandonment, Post-Purchase.
- Use Klaviyo’s advanced segmentation and dynamic content features from day one.
- Plan your initial campaigns to align with your newly defined segments.
Phase 4: Test & Launch
- Thoroughly test all forms, flows, segments, and integrations.
- Correctly configure SPF, DKIM, and CNAME records for deliverability.
- Implement an IP warming strategy for the first 2-4 weeks.
- Monitor key performance metrics closely after launch.

Why partner with Elite Brands for your Mailchimp to Klaviyo switch

You can follow this playbook yourself. It works.

But it takes time, and the technical details matter. A mistake in the DNS setup or data import can set you back for months. We’ve been called in to fix migrations that went wrong, and it’s always more expensive than doing it right the first time.

When we manage a migration, we’re not just moving you to a new platform. We’re implementing a growth strategy. Because we are Klaviyo Master Gold Partners, our team knows the platform inside and out. We’ve run the numbers, and our clients typically see a 20-40% increase in email-attributed revenue in the first six months after migrating with us.

If you want a strategic partner to handle this for you, you can start with a free Klaviyo audit. We’ll analyse your current setup and show you exactly what the opportunity looks like.

Not sure if your Klaviyo setup is leaving money on the table?

We’re Klaviyo Master Gold partners. Our free Klaviyo Audit checks the 24 things that most often kill email revenue on Shopify stores. Takes 5 minutes to request, delivered within 48 hours.

Request the free Klaviyo Audit →

This playbook provides the map. Following it ensures you end up with a powerful marketing asset, not just a new monthly bill.