Migrating your email platform should feel straightforward. Export your list, rebuild your flows, flip the switch. Job done.
In reality, it's one of the most disruptive tech stack changes a D2C brand can make, and the brands that struggle through it almost always wish they'd asked more questions before they started.
We see it regularly. A brand gets frustrated with their current platform; deliverability feels off; the segmentation is clunky; a competitor is raving about some new, shiny tool, and suddenly, a migration feels like the obvious fix. Sometimes it is. But often, the platform isn't the real problem. And even when it is, a poorly planned migration can quietly kill your email revenue for months.
So before you make the change, ask yourself these five questions.
1. Are you solving a platform problem or a strategy problem?
This is the big one, and it's the question most brands skip entirely.
If your email performance is underwhelming with low open rates, weak flow revenue, and poor retention, it can be tempting to look at a new tool. But more often than not, the issue is what's being done with the tool, not the tool itself. Undercooked segmentation, basic automations that haven't been touched in two years, and campaigns that go out to everyone with no personalisation. These are strategy problems, not platform problems.
A shiny new platform won't fix a weak strategy. It'll just give you a more expensive place to run it.
Before you even look at alternatives, audit what you've actually built. How many active flows do you have? Are your segments based on real behaviour or just basic list splits? Are you using your platform's native analytics to understand what's driving revenue? If the honest answer is "not really", that's your starting point, not a migration.
2. What's the real cost of rebuilding?
When brands assess migration costs, they almost always anchor on the platform licencing fee comparison. Platform A costs X, Platform B costs Y, so the saving is Z. That maths is rarely the full picture.
The hidden costs are in the rebuild. Every flow you've built, from your welcome series, post-purchase sequence, win-back, browse abandonment, back-in-stock, now needs to be recreated from scratch on the new platform. That takes time and expertise, and while it's being rebuilt, those flows aren't running. Depending on your current flow revenue contribution, you could be looking at weeks of significant lost income before the new setup is even at parity with what you had before.
Then there's your segmentation logic. Behavioural segments built over months or years don't automatically transfer. Your data structure on the new platform may be different. Properties, flow filters, property updates, and events that your current platform tracks might not exist natively elsewhere, or need to be recreated via integrations.
Map out every single flow, segment, and integration you currently use. Then be brutally honest about what it will cost in time, resources, and lost revenue to get back to that point on a new platform. For most brands, that number is significantly higher than the headline licensing savings, and optimising the current setup is the better option.
3. What data won't transfer cleanly, and does it even matter?
Your data can move with you. Contact records, purchase history, engagement data, custom properties, and behavioural signals. A well-planned migration means you arrive on the new platform with your customer intelligence intact.
What is worth thinking hard about is how much preparation the migration requires to go smoothly. Data does not move itself.
Different platforms structure data differently, so your migration needs a clear plan. Map out which data needs to move, which pieces will need manual processing, how it maps across to the new platform’s structure, and which integrations need to be reconnected. Events and properties that drive your key flows and segments should be validated in the new environment before you go live, so you know everything is firing correctly from day one.
The brands that run into problems are the ones that skip planning and assume it will all just work. Build a proper data migration plan, test everything, and you will arrive on the new platform ready to hit the ground running.
4. When are you planning to do this?
Timing a migration badly can do more damage than the migration itself.
The most obvious red line is peak trading. No migration should be happening in the six to eight weeks (we’d recommend nothing in the 10 to 12 weeks) before Black Friday, during your biggest seasonal push, or in the run-up to any campaign period that contributes significantly to your annual revenue. The risk of something going wrong, flows not firing, deliverability dipping during the warmup period, and segments not behaving as expected, is simply too high when the stakes are at their highest.
But it's not just about avoiding obvious peak periods. Deliverability itself needs time. When you migrate to a new platform, you're sending from a new domain address with no sending history. ISPs treat you as an unknown quantity. You need to warm that IP gradually, starting with small volumes to your most engaged subscribers and building up over several weeks before you can reliably send at full volume without hitting deliverability issues.
The ideal migration window is a genuinely quiet period, not just quieter than normal, but genuinely low stakes. You want enough runway to properly warm your IP and iron out any technical issues before you rely on the platform to perform.
5. Does your team have the capacity and the knowledge to do this properly?
A poorly executed migration is worse than not migrating at all. And doing it well takes more resources than most teams anticipate.
You need someone who understands the technical side of the new platform deeply enough to rebuild your flows and segments in a way that leverages what it does well, not just recreate what you had before. You need someone to manage the data migration, mapping, scheduling, and QA everything before it goes live. You need to plan your IP warmup strategy and monitor deliverability closely throughout.
If your current team is already stretched, adding a full platform migration on top of day-to-day campaign management is a recipe for things slipping through the cracks. The migrations we've seen go wrong most often aren't down to the platform itself; they're down to teams underestimating the workload, failing to set up correctly, and cutting corners on QA.
Be honest about capacity before you commit. If you don't have the in-house bandwidth to do this properly, either delay until you do or bring in external support to manage it.
Quick Checklist: Before You Migrate
Run through these before you make any decisions:
- Are you solving a platform problem or a strategy problem? Audit your current setup honestly before assuming the tool is the issue.
- Have you calculated the true cost of migration? Include flow rebuild time, lost flow revenue during transition, and integration work, not just platform licencing fees.
- Do you know what data won't transfer cleanly? Understand exactly what historical data you can bring across and how it will function on the new platform.
- Have you chosen the right window? Avoid peaks, budget for IP warmup time, and give yourself genuine runway to get to parity before it matters.
- Does your team have the capacity to do this properly? If not, delay or get support; a rushed migration is almost always more expensive than a well-planned one.
None of this is meant to put you off migrating. Sometimes a new platform genuinely is the right move, and when it is, the uplift in performance can be significant. But it's a serious decision that deserves serious thought, and the brands that approach it that way are the ones that come out the other side in a better position than when they started.
If you're weighing up a platform move and want a frank conversation about whether it makes sense for your brand, Get Better is a UK Klaviyo Elite agency specialising in CRM and retention for D2C eCommerce brands. We've helped plenty of brands migrate CRM platforms, and talked plenty more out of migrating when it wasn't the right call. You can find us here.
