Migrate from Brevo to Smartlead: Step-by-Step Playbook

If you’re reading a migration guide right now, you’re probably past the “should I switch” question. Maybe Brevo throttled your sending volume. Maybe your deliverability tanked on their shared infrastructure. Or maybe you finally hit the wall where a newsletter-first platform simply cannot run the sequencing and inbox rotation you need for cold outreach. Whatever the trigger, the risk is not the decision. The risk is the execution. A sloppy migration torches domain reputation, re-contacts opted-out leads, and drops warm sequences mid-thread. This playbook keeps that from happening.

Before You Migrate

The prep work is where migrations actually succeed or fail. Rushing into Smartlead setup without a clean export is the most common failure mode in cold email stack switches. I’d put the suppression list export at the top of the list, above everything else, because it’s the one mistake you cannot undo after the fact.

Do all of this before you touch Smartlead:

• Export all contact lists from Brevo as CSV, including every custom field column you use in personalization tokens
• Export your suppression/unsubscribe list separately (Brevo calls this “Blocklist” under Contacts > Blocklist). This is not included in standard list exports
• Screenshot or copy every active sequence: subject lines, body copy, wait days, send conditions. Brevo does not export sequences as importable files
• Audit your sending domains: note every domain you have authenticated in Brevo (Settings > Senders and IP > Domains)
• Pause, do not delete, any active campaigns in Brevo. Deleting loses the thread history and reply tracking
• Check your current DNS records: pull SPF, DKIM, and DMARC for each domain using MXToolbox before you change anything

If you have been using Brevo for transactional email alongside cold outreach, keep Brevo active for transactional until you have a dedicated transactional provider standing by. Postmark or Resend are the two I’d point you toward. Smartlead is not a transactional platform, full stop.

The Migration Steps

What Breaks and What Does Not Transfer

The merge syntax difference catches almost every team mid-migration. Brevo uses double curly brace syntax for personalization. Smartlead uses a similar but distinct format. Paste Brevo templates directly into Smartlead without updating variable names and every email goes out with a raw unparsed token where the first name should be. Don’t do it.

Brevo variable syntax (do not paste this):
{{ contact.FIRSTNAME }}

Smartlead variable syntax (use this):
{{first_name}}

Check Smartlead's variable reference
in their docs under Campaign Variables
before rebuilding any template.
Map every custom field during CSV import
so variables resolve correctly on send.

Other things that do not transfer cleanly: A/B test results from Brevo campaigns stay in Brevo. Open rate history per contact is not portable. Any Brevo automation that triggered based on email opens or clicks needs to be rebuilt in Smartlead’s campaign conditions or in your CRM workflow layer.

What does transfer cleanly: contact data (via CSV), your copywritten sequence content (manually rebuilt), and your domain authentication (once DNS is updated).

Verify It Worked

Before you declare the migration done, run these four checks:

1. Send a test email from each mailbox through Smartlead to a Mail-Tester address and confirm you score 9 or higher. A score below 8 means an auth record is broken.
2. Confirm suppression list coverage by searching one known unsubscribe email in Smartlead’s unsubscribe list. If it appears, the import succeeded.
3. Check the warmup dashboard for each mailbox: spam placement rate should be below 3% before you enable live campaign sending.
4. Send one campaign to a small segment first (100 to 200 contacts) and monitor replies, bounces, and spam reports for 48 hours before opening full volume.

For a deeper look at how Smartlead’s deliverability model compares to other senders, the Instantly vs Smartlead deliverability breakdown is worth reading alongside this playbook. And if you are evaluating whether Smartlead is the right destination at all, the Brevo cold email alternatives roundup covers the full field.

Should you migrate to Smartlead, or stay on Brevo?

Choose Smartlead if

• Your primary use case is cold outbound, not newsletters or transactional email
• You need inbox rotation across multiple mailboxes and domains
• You want per-mailbox warmup and deliverability monitoring built in

From $39/mo Try Smartlead →

Choose Brevo if

• You send a mix of cold outreach, newsletters, and transactional email from one platform
• Your team is not ready to manage dedicated mailbox infrastructure
• Volume is low enough that shared SMTP relay does not hurt deliverability

Free tier available Stay on Brevo →

Make the Switch Clean

The mechanics of migrating from Brevo to Smartlead are straightforward: export, authenticate, warm, rebuild, verify. The failure modes are almost always in the sequencing of those steps, not the steps themselves. Suppressions before lists. Warmup before sending. Test before full volume. Follow that order and you arrive at Smartlead with a healthier sending setup than you had on Brevo.

If you want to go deeper on infrastructure before committing, the best cold email stack under $300 guide covers how Smartlead fits into a full outbound setup without overspending. And if you are also evaluating Instantly before landing on Smartlead, the Instantly to Smartlead migration playbook covers the same steps with Instantly-specific export notes.