Overview
Birthday emails have 342% higher revenue-per-email than standard promotions. Once you collect birthday data (date of birth or just birth month), Mailchimp's automation sends a personalized email with a special offer on or near their birthday — every single day, to whoever has a birthday, without you touching anything.
Before you start
- Mailchimp account
- Birthday merge field added to your audience
- A birthday offer ready (discount, free item, etc.)
Step-by-step guide (4 steps)
Collect birthday data
Add a birthday field to your signup form. Use Month + Day only (not year, which feels intrusive for adults). Label it 'Birthday (for a special gift!)' to increase completion.
If you have an existing list without birthdays, send a one-time campaign asking subscribers to update their profile — offer an incentive.
Create the Birthday automation
In Mailchimp Automations, select 'Birthday' as the trigger type. Set it to trigger on the subscriber's birthday month/day. Add a 1-day delay so the email arrives day-of.
Design a celebratory email
Keep it personal and warm. Lead with 'Happy Birthday, [First Name]!' Use their name in the subject line. Include a single compelling offer: 20% off, a free gift with purchase, or a free consultation.
Add a reminder (optional)
Add a second email 3 days before their birthday: 'Your birthday's almost here — here's an early gift.' This catches people who might miss the day-of email.
What you'll get
Highest ROI email automation in retail and service businesses
Feels personal — customers are delighted by it
Runs daily for every subscriber automatically
Increases repeat purchase and loyalty
Common mistakes to avoid
Not having a compelling offer — 'Happy Birthday!' with no offer converts poorly
Using year in the birthday field (people won't fill it in)
Missing the re-opt-in for subscribers added before the birthday field existed
Frequently asked questions
Do I need coding experience to set up this Mailchimp automation?
No coding is required. This guide walks you through everything using Mailchimp's built-in features and Zapier's visual interface. If you can follow a recipe, you can follow this guide.
How long does this automation take to set up?
Most users complete this setup in 30–60 minutes on their first try. Once set up, it runs completely automatically with zero ongoing effort.
What happens if the automation fails?
Zapier and Make both have error notifications and task history, so you'll know immediately if something goes wrong. We cover troubleshooting steps in the guide above.
Can I customize this automation for my specific business?
Absolutely. The guide includes notes on common customizations. Most automations have multiple variation points — timing, conditions, notification recipients, and more.