Birthday Email Marketing
Drive loyalty & sales! Send automated birthday emails & discounts to delight customers. Easy setup.
Mailchimp sends birthday emails, but collecting the data is on you. A setup guide for Shopify stores.
Mailchimp can send birthday emails. The problem is it doesn’t automatically know your Shopify customers’ birthdays. You need a way to collect that data first, then sync it to Mailchimp, and then trigger the automation. This step-by-step guide covers the complete setup: from birthday collection in Shopify to a live birthday email campaign in Mailchimp. The Happy Birthday app for Shopify handles the data collection and passes birthday fields to Mailchimp so your automation runs without manual work.
TL;DR: Mailchimp can send birthday emails. But it doesn’t collect birthdays from Shopify. That’s the missing piece most merchants don’t realize until they’re already set up.
Mailchimp is everywhere. Probably the most well-known email platform out there. And yes, it has birthday automation. Sounds perfect for your Shopify store, right? Here’s the thing nobody tells you upfront: when you connect Mailchimp to Shopify, customer data syncs over, but birthdays? Empty field. Mailchimp doesn’t know when anyone’s birthday is. (Looking for something simpler? Check out the Happy Birthday App for Shopify.)
Here’s what happens when you set up Mailchimp with Shopify:
Because Shopify doesn’t collect birthdays. There’s no birthday field at checkout. Customer accounts don’t ask for it. So Mailchimp has nowhere to pull that data from.
Mailchimp’s birthday automation sits there, ready to go, with zero birthdays to trigger on.
Add a birthday field to your Mailchimp popup. When people subscribe, they enter their birthday too.
The catch: this only captures people who fill out your form. Customers who buy without subscribing? No birthday. Your existing customers? You’d have to ask them to subscribe again just to get their birthday.
If you’ve got birthday data somewhere – old CRM, customer surveys, whatever – you can import it.
The catch: one-time fix. Doesn’t help with new customers. And if your dates aren’t formatted consistently (spoiler: they probably aren’t), you’ll spend hours cleaning the data.
This is what most merchants end up doing. Apps like the Happy Birthday App collect birthdays on the thank you page after checkout, then sync to Mailchimp.
Customer buys → enters birthday → data flows to Mailchimp → automation triggers. No manual work.
Once you have birthday data, setup is straightforward:
The hard part isn’t here. The hard part is getting birthdays into the system in the first place.
Mailchimp needs dates in a specific format. European customers write 05/03 meaning March 5th. American systems read it as May 3rd. Import mixed formats and your emails go out on the wrong days.
The Happy Birthday App handles this – you pick DD/MM or MM/DD based on your customer base, and everything syncs to Mailchimp correctly formatted.
Two choices:
Single code for everyone – Create “BIRTHDAY20” in Shopify, paste it in your email. Simple. But people share codes on coupon sites.
Unique codes per customer – More secure, better tracking. But Mailchimp doesn’t generate these. You need an integration that creates unique Shopify discounts and passes them to Mailchimp for each recipient.
Dedicated birthday apps handle unique codes automatically. It’s built in.
Birthday automation needs a paid Mailchimp plan – Essentials or higher. Free plan doesn’t include automation journeys.
If you’re already paying for Mailchimp for newsletters and other flows, adding birthday automation makes sense. If you’d only use Mailchimp for birthdays? A Birthday Club via a dedicated app is way more cost-effective.
If setting up Mailchimp for birthdays sounds like a lot – collecting data, formatting dates, syncing systems, building automations – there’s an easier way.
The Happy Birthday App does everything:
Or if you love Mailchimp’s email editor, use the app for collection and sync to Mailchimp for sending. Get the easy data collection with the builder you prefer.
Mailchimp can send birthday emails. But “can” isn’t the same as “easy.” The real work is collecting birthday data from your Shopify customers – and that’s the part Mailchimp doesn’t do. Thinking about switching to Klaviyo or Omnisend? Same problem there.
For the power of birthday emails without the setup hassle, see the Happy Birthday App for Shopify. Or just try it free.
Shopify doesn’t store customer birthdays by default. When you connect Shopify to Mailchimp, contacts sync across, but birthday data doesn’t come with them because it doesn’t exist in Shopify’s standard customer fields. You need to first collect birthdays from your customers and store them as custom data, then make that data available to Mailchimp.
Most merchants don’t realise this until they’re already building the Mailchimp automation. The flow is: collect birthdays in Shopify, sync to Mailchimp as a contact field, build the birthday automation in Mailchimp. Let’s go through each step.
Add a birthday collection form to your thank you page or account page using the Happy Birthday app. The app adds a simple date of birth field to the customer journey and stores the birthday as a custom customer metafield in Shopify. This is the data Mailchimp needs.
You can also collect birthdays via a pop-up at checkout or through a dedicated birthday landing page. The important thing is that the birthday gets stored against the customer record in Shopify.
Once birthdays are stored in Shopify, you need to sync them to Mailchimp as a contact merge field. The Happy Birthday app integrates with Mailchimp and automatically passes the birthday date as a custom merge field (for example: BIRTHDAY or BDAY) when a customer’s birthday is collected or updated.
In your Mailchimp audience, go to Audience settings and verify that the birthday merge field exists. If you’re setting it up manually, create a Date merge field with a tag like BIRTHDAY. Make sure the format matches what Mailchimp expects for date-based triggers.
In Mailchimp, go to Automations and create a new Customer Journey or classic Automation. Select a date-based trigger and point it at your BIRTHDAY merge field. Set the trigger to fire on the date each year, and configure it to send 0 days before (on the birthday) or 7 days before if you want an early bird offer.
Design your birthday email with a personalised subject line, the discount code or gift, and a clear CTA. Mailchimp’s merge tags let you include the customer’s first name automatically: *|FNAME|*. Set up a follow-up reminder email 3 days before the offer expires to recover unconverted opens.
Mailchimp supports dynamic promo codes via a connection to Shopify. If you’re using a dedicated birthday app, unique discount codes can be generated per customer and passed directly into the Mailchimp email as a personalised code. This prevents code sharing and increases conversion rates compared to a single generic code.