Leaving Mailchimp is mostly straightforward. The parts that go wrong are predictable, and almost all of them happen in the first week after the switch rather than during the export itself.
This covers what actually moves, what does not, the sequence that protects your deliverability, and the one mistake that damages sender reputation badly enough to undo the whole exercise.
First: is migrating the right call?
Worth being honest about, because migration has a real cost in time and short-term deliverability risk.
Good reasons to leave: you are billed for contacts you rarely email; you keep hitting the four-flow-step automation cap on Essentials; you are being auto-billed for overages; you need transactional email on the same bill, which Mailchimp sells separately.
Weaker reasons: you want a cheaper headline price but send daily to a small list — per-contact billing may genuinely suit you. Or your stack depends on several of Mailchimp’s 300+ integrations, which is a real advantage you would be giving up.
The detail behind each is in Mailchimp pricing explained.
What moves, and what does not
Moves cleanly: contacts and their custom fields, tags and segments as data, unsubscribes and bounces, and campaign history as an export.
Has to be rebuilt: automations. No platform imports another’s workflow logic — not Mailchimp to anyone, not anyone to Mailchimp. Templates usually need rebuilding too, because editor markup does not port between platforms.
That sounds worse than it is. Most accounts have a handful of flows that matter and several nobody has opened in a year. Migration is a good moment to delete the latter.
The order that protects your deliverability
- Export contacts with consent data. Not just addresses — signup source, timestamp and opt-in method. You need these to demonstrate consent, and in several jurisdictions you are required to hold them.
- Export unsubscribes, bounces and complaints separately. This is the step people skip, and it causes the real damage. See the warning below.
- Set up authentication on the new platform. SPF, DKIM and DMARC for the new sender, verified before any sending. See SPF, DKIM and DMARC explained.
- Import contacts, then import suppressions immediately — before a single campaign goes out.
- Rebuild your core automations. Welcome series first, then cart recovery if you run one. Copy for both is in our template library.
- Warm up if you send meaningful volume. A new sending setup has no reputation history. Start with your most engaged segment and ramp. See how to warm up an email domain.
- Run both accounts in parallel for two to four weeks. Keep Mailchimp alive until the first sends are confirmed landing.
- Cancel only after a full billing cycle of clean sending.
The mistake that does real damage
Emailing people who had already unsubscribed on Mailchimp.
It happens when someone exports the audience, imports it to the new platform and sends — without carrying the suppression list across. Mailchimp holds unsubscribes and bounces separately from the main audience export, so a straight contact import loses them.
The result is that everyone who opted out over the past few years receives a campaign they explicitly refused. Those people are far more likely to hit the spam button than to unsubscribe again, and a complaint spike on a brand-new sending domain with no reputation history is close to the worst possible start.
It also breaches consent rules in most jurisdictions — New Zealand and Nigeria treat continuing to mail an unsubscribed contact as a straightforward breach. See email marketing rules by country and email list cleaning.
Import suppressions first, before contacts if your platform allows it. Then verify the counts match.
How long it takes
For a typical small business list with two or three automations: a working afternoon of setup, then two to four weeks of parallel running before you cancel.
For a larger account with complex flows and a big list: a week of setup and rebuild, then four to six weeks of warm-up and parallel running.
Setup is rarely the bottleneck. The waiting is — and rushing the warm-up is how migrations fail.
Migrating to Bluey Email specifically
If you send more than 100,000 emails a month, our team does the migration for you — contacts, suppressions, templates and automations rebuilt on your behalf rather than handed over as a help article. You approve the flows before anything sends.
Below 100,000 a month we guide you through it: export steps, suppression import, authentication setup and a warm-up plan, with a real person answering questions rather than a documentation link.
That threshold is worth stating plainly rather than implying a done-for-you service everyone receives.
On the billing side, Bluey charges on emails sent, not contacts stored, so dormant addresses cost nothing to keep — and transactional email is included on every plan, so receipts and password resets stop needing a second subscription.
Frequently asked questions
Will I lose my subscribers?
No. Contacts export cleanly from Mailchimp as CSV with custom fields intact. What you must also export is the suppression list — unsubscribes, bounces and complaints — which sits separately.
Can I move my automations?
Not automatically. No platform imports another’s workflow logic, so flows are rebuilt. For most accounts that is a few hours, and a useful cull of unused automations.
Will my deliverability drop?
Temporarily, if you move significant volume without warming up. A new sending domain has no reputation history. Ramp gradually starting with engaged contacts and the dip is brief.
Should I cancel Mailchimp immediately?
No. Run both for two to four weeks. Keeping the old account until the new one is proven costs one month’s subscription and removes nearly all the risk.
What about my templates?
Usually rebuilt rather than imported — editor markup does not port between platforms. Copy the content across and rebuild the layout.
Do I need to tell subscribers I have switched?
Not required, and generally unnecessary. What matters is that the sender name and address stay recognisable, so people do not report a familiar brand arriving from an unfamiliar sender.
Weighing it up? Bluey Email vs Mailchimp covers the differences, Mailchimp alternatives covers the wider field, and how to migrate email service provider covers the generic process for any platform.
Start free — 500 emails a month, no card required, so you can build and test before moving anything.