How to Automate Email Marketing with MailerLite & Zapier in 4 Simple Steps
Most businesses waste hours manually adding subscribers, tracking unsubscribes, and moving data between apps. This Zapier integration eliminates the busywork by automatically syncing MailerLite with your CRM, forms, and spreadsheets — while you sleep.
Why Automate MailerLite with Zapier?
Manual email list management is one of the biggest time-wasters for small businesses. Every form submission, CRM update, or spreadsheet row requires copying data between apps — a process prone to errors and delays.
By connecting MailerLite to Zapier, you create a seamless flow where subscriber data moves automatically between systems. The 2:15 mark in the video shows how this eliminates hours of repetitive data entry while ensuring your lists stay perfectly synced.
Typical results: Businesses save 5+ hours weekly on email list management while seeing 20-30% fewer unsubscribes from timely, automated follow-ups.
Step 1: Connect MailerLite to Zapier
The foundation of any Zapier automation is a secure connection between apps. For MailerLite, this requires your API key — a unique password that lets Zapier access your account without storing your login credentials.
How to Find Your MailerLite API Key
- Log into your MailerLite account
- Click your profile icon → Integrations
- Navigate to Developer API
- Click "Generate Token"
- Copy the alphanumeric key
In Zapier, search for MailerLite in the "Add Connection" menu and paste this key when prompted. The connection establishes instantly, allowing you to build workflows.
Step 2: Set Up Your Trigger
Zaps always start with a trigger — an event that kicks off your automation. For MailerLite, common triggers include:
- New subscriber: When someone joins a specific list
- Subscriber unsubscribed: For cleaning up other databases
- Tag added: Trigger workflows based on subscriber segmentation
At 3:40 in the video, we demonstrate selecting "New Subscriber" as the trigger, then choosing which MailerLite group to monitor. This ensures the Zap only runs for relevant signups.
Step 3: Configure the Action
After defining what starts your Zap, you choose what happens next. MailerLite can serve as either:
- Trigger app: Where events start workflows in other apps (e.g., adding new subscribers to Google Sheets)
- Action app: Where MailerLite receives data from other apps (e.g., adding form submissions as subscribers)
The video at 5:15 walks through mapping form fields to MailerLite subscriber properties, ensuring names, emails, and custom fields transfer accurately.
Step 4: Test & Activate Your Zap
Before going live, Zapier's test mode verifies your automation works correctly. This critical step catches mapping errors that could create duplicate or incomplete records.
At 6:30 in the tutorial, we show how to:
- Run a test with sample data
- Check MailerLite for the test record
- Adjust field mappings if needed
- Name your Zap descriptively (e.g., "Google Forms → MailerLite")
- Toggle the activation switch
Pro Tip: Schedule a monthly check to ensure your Zaps still work after app updates. Set a calendar reminder when activating new automations.
Watch the Full Tutorial
See the complete MailerLite-Zapier integration process in action, including troubleshooting tips for common connection errors at the 4:50 mark.
Frequently Asked Questions
Common questions about MailerLite-Zapier automation
Yes, the integration uses OAuth and API keys rather than storing your MailerLite login credentials. Zapier maintains SOC 2 Type II compliance for data security.
Your API key functions like a unique password — you can regenerate it anytime if compromised, immediately revoking access for all connected apps.
Absolutely. Zapier supports adding/removing tags based on triggers like form submissions, purchase events, or CRM updates. This enables advanced segmentation without manual work.
For example, you could tag subscribers as "High-Value" when their order total exceeds $500 in Shopify, then trigger a targeted email sequence in MailerLite.
Zapier polls most apps every 1-15 minutes depending on your plan. Paid plans offer faster polling intervals (1-2 minutes) while free plans check less frequently (15 minutes).
For time-sensitive workflows like webinar registrations, consider upgrading to ensure immediate processing.
Groups are static lists you manually add subscribers to (perfect for Zapier automation). Segments are dynamic groups based on subscriber behavior or properties that update automatically.
When setting up Zaps, always use Groups as your trigger or action target since they provide stable, predictable results.
Yes. The "Add/Update Subscriber" action in Zapier will either create a new record or update an existing one based on email address. This prevents duplicates when syncing CRM data.
At 7:20 in the video, we demonstrate how this works when testing your Zap before activation.
Common issues include incorrect group selection, API key errors, or field mapping mistakes. First, verify your MailerLite connection in Zapier's "Connected Accounts" section.
If the connection works but data isn't flowing, recheck that you've mapped all required fields (especially email) and selected the right subscriber group in your Zap's action step.
GrowwStacks specializes in building custom email automation workflows that save businesses 10+ hours weekly. Our Zapier experts handle the technical setup while you focus on your marketing strategy.
We'll design a complete MailerLite integration tailored to your:
- Lead capture forms
- CRM data flows
- Segmentation rules
- Re-engagement sequences
Stop Wasting Hours on Manual Email Workflows
Every minute spent copying subscriber data between apps is time stolen from growing your business. Let GrowwStacks build your MailerLite-Zapier integration in under 48 hours.