How to Migrate from Mailchimp: A Step-by-Step Guide

Migrating email marketing platforms feels daunting — your list is one of your most valuable business assets and you can't afford to lose subscribers or damage your sender reputation during the switch. The good news: a careful migration is straightforward and usually takes less than a day. Here's how to do it.

Before You Migrate: The Checklist

Document all active automations (sequences, triggers, delays, conditions)
Export all audience lists including custom field data and tags
Screenshot or export your highest-performing email templates
Note all integrations (e-commerce, CRM, forms, landing pages)
Check your current domain authentication setup (SPF, DKIM, DMARC)
Identify your most critical segments and how they're defined

Step 1: Export Your Mailchimp Contacts

In Mailchimp, go to Audience → Manage Audience → Export Audience. You'll download a CSV with all contact data including email address, name fields, tags, and custom merge fields. If you have multiple audiences in Mailchimp, export each one separately.

Important: review the CSV before importing. Clean up any obvious issues — missing names, duplicate addresses, obvious spam traps.

Step 2: Set Up Your New Platform

Before importing your list, configure the platform foundation:

Connect and verify your sending domain
Set up SPF, DKIM, and DMARC records (your new platform will provide these)
Configure your from name and from address
Set up your unsubscribe page and preference center

Don't import your list until domain authentication is complete. Sending from an unauthenticated domain immediately after migration is the fastest way to end up in spam.

Step 3: Import Your Contacts

Upload your exported CSV. Map your Mailchimp merge fields to the corresponding fields in your new platform. SuperMailr's AI field mapper automatically detects and maps common columns — first name, last name, email, phone — and flags any ambiguous ones for you to review manually.

Respect suppression lists: if you have unsubscribes, bounces, or spam complaints from Mailchimp, import those as suppressed contacts so you don't accidentally mail them.

Step 4: Recreate Your Automations

Rebuild your most important automations before fully switching over. Start with the highest-impact ones: welcome series, any active drip campaigns, and abandoned cart sequences. You don't need to recreate everything immediately — identify what's actively running and generating revenue, and prioritize those.

Step 5: Update Signup Forms and Integrations

Update your website signup forms to point to your new platform. Update any integrations (Shopify, WordPress, Zapier, etc.) to connect to the new account. Test each integration before going live.

Step 6: Warm Up on Your New Infrastructure (If Applicable)

If you're moving to a new sending IP (which most platform migrations involve), don't immediately send your full list. Start with your most engaged subscribers — people who opened your last 5+ emails. Gradually increase volume over 2-4 weeks. Your engagement history doesn't transfer between platforms, so ISPs treat your new infrastructure as new.

Step 7: Run Both Platforms in Parallel Briefly

Keep your Mailchimp account active for 2-4 weeks after migration. Don't cancel immediately. This ensures you can reference historical data, re-export anything you missed, and provides a fallback if something goes wrong. Once you're confident everything is running smoothly, close the Mailchimp account.

What Carries Over vs. What Doesn't

Carries Over	Starts Fresh
Contact data and custom fields	Email open/click history
Tags and segments (via CSV export)	Sender reputation on new IP
Unsubscribes and bounces	Platform-specific analytics
Email templates (manually recreated)	A/B test results