Latest / The Retention Marketing Podcast with Fexingo: Email, SMS, and Loyalty for Repeat Customers / How a Beauty Brand Uses Birthday Email to Boost Repeat Rate by 50 Percent
Transcript
- Lucas: So for episode 100, I wanted to look at something that sounds almost too simple to work: birthday emails. Specifically, how a beauty brand called Luna & Sage used a three-email birthday sequence to boost repeat rate by about 50 percent among customers who received it. Luna: Okay, I have to admit I'm skeptical. Birthday emails feel like table stakes—everyone does them. What made this one different? Lucas: Fair point. Most brands send one birthday email with a 15 or 20 percent off coupon, and they get a modest lift. Luna & Sage did three things differently. First, they collected birthdate at sign-up—not during checkout, not as an afterthought. It was part of the welcome flow from day one. They got birthdates on about 70 percent of new subscribers. Luna: That's a solid capture rate. Did they use an incentive—like a free sample—to get people to share their birthdate? Lucas: Yeah, exactly. They offered a mini lip gloss set for completing the profile, which included birthdate. So the cost per acquired birthdate was essentially zero after the initial sample cost. Second, they set up a three-email sequence. Email one goes out five days before the birthday—it's a teaser: 'Something special is coming for your birthday.' No offer yet, just anticipation. Email two lands on the actual birthday with the offer: a free full-size product—retail value about $28—on orders over $50. Luna: So the threshold is high enough to protect margin. What was the free product? Lucas: It rotated monthly—one month it was a serum, next a moisturizer, always a hero product. That's smart because it keeps the offer fresh and lets them feature new launches. Email three goes out three days after the birthday as a last call. That's the structure. They ran a controlled test: customers who entered the birthday flow versus a randomly selected control group that got no birthday email. The repeat purchase rate in the 90 days after the birthday was 50 percent higher for the triggered group. Luna: Fifty percent higher is a huge number. I want to dig into that. Is that repeat rate from the birthday purchase, or repeat purchases in general? And what was the baseline? Lucas: It's repeat purchases in the 90-day window—any subsequent order, not just the one from the email. The baseline repeat rate for the control group was about 8 percent, which is typical for a beauty brand in that window. The birthday group hit 12 percent. Fifty percent lift sounds dramatic, but absolute terms: four extra repeat customers per hundred. That's still a meaningful increment when you multiply by the number of birthdays per month. Luna: Okay, so four points. And average order value—did it hold up? Sometimes when you push repeat rate with a gift, you get people buying cheap items just to get the freebie. Lucas: That was my first question too. They tracked AOV for both groups. The birthday group actually had a slightly higher AOV—about $52 versus $49 for the control. The $50 threshold did its job. Most people added a little extra to hit the threshold. The free product cost them about $8 in COGS, so the margin on that incremental $2 in AOV plus the repeat purchase more than covered it. Luna: So the economics work. But what about timing? If someone just bought two weeks before their birthday, are they annoyed to get a birthday email asking them to spend more? Lucas: Great question—and that's the third thing they did differently. They segmented by recency. If a customer had made a purchase within the last 30 days, they suppressed the birthday email entirely. No teaser, no offer. They'd get a different version after their birthday—a 'we missed your birthday, here's a treat' email about 60 days after their last purchase. That way they weren't pestering recent buyers. Luna: That's smart. I've definitely gotten a birthday email from a brand two days after placing an order and thought, 'Really? You couldn't have timed this better?' Lucas: Right. The suppression rule kept the experience clean. And they also excluded customers whose birthdate they'd collected but who had never purchased—those got a different flow with a lower threshold. So the birthday email itself wasn't one-size-fits-all. Luna: Okay, I'm starting to see why this worked. It's not the gimmick—it's the segmentation and the three-email structure. But I wonder: does the lift persist beyond 90 days? Or do those customers just revert to normal behavior? Lucas: They looked at six-month repeat rate too. The effect diminished a bit—the birthday group had about a 20 percent higher repeat rate at six months—but it didn't vanish. The theory is that the birthday interaction creates a positive emotional association with the brand. You get a gift on your day, you feel valued, you're more likely to come back. It's not just a discount—it's a relationship moment. Luna: I buy that. In beauty especially, the emotional connection is huge. A 20 percent off coupon doesn't say 'I know you,' but a birthday gift does. So what's the catch? Why don't more brands do this well? Lucas: The biggest barrier is data quality. If you collect birthdate at checkout in a rush, you get fake dates—people typing January 1, 1990 because they don't want to share. Luna & Sage made it part of the profile setup, not the transaction. And they validated dates: if someone's birthdate made them under 13, they flagged it. But the real reason most brands don't see these results is they treat birthday emails as a one-and-done marketing blast instead of a lifecycle touch. Luna: So it's not about the channel. It's about the strategy. That's actually a good reminder for our listeners. By the way, if this kind of specific breakdown is useful to you—if you've ever taken a tactic from this show and applied it to your own brand—that's exactly why we keep this podcast ad-free. Listener support is what makes that possible. You can help keep it going at buy me a coffee dot com slash fexingo. Lucas: Yeah, we love hearing that these episodes spark real changes. And we want to keep it accessible to anyone who needs it. So thanks for considering that. Back to birthday emails—one more layer I found interesting: Luna & Sage also tested sending the birthday email via SMS instead of email for a small segment. Luna: Oh, I bet SMS had higher open rates but maybe lower conversion? People might be more protective of their phone number than their email address. Lucas: Exactly. They only had birthdates for about 20 percent of their SMS subscribers, so the sample was small. But the SMS group had a 98 percent open rate—obviously—and the click-through was about 15 percent, versus email's 45 percent open and 8 percent click. The conversion rate was actually similar: around 5 percent for both. So SMS didn't outperform email for the birthday trigger, but it didn't underperform either. The main issue was reach—they just didn't have enough SMS birthdates. Luna: That's a good data point. So if you're a brand with a robust SMS list, you could run birthday campaigns there and get comparable results. But email is probably the better workhorse for this because you can capture the date more easily. Lucas: Right. And the cost per email is essentially zero. The SMS costs per message add up. For a low-frequency trigger like birthday, email makes more sense financially. Now, one more thing I want to highlight: they also tested the free gift versus a discount. Same threshold of $50, but one group got a 20 percent off coupon, the other got the free product. The free product group had a 30 percent higher repeat rate than the discount group. Luna: Wow. So the psychology of a gift really matters. A discount says 'give us more money to save,' a gift says 'we're giving you something.' Even if the cost to the brand is similar. Lucas: Exactly. And the free product also acts as a sampling vehicle. If the free product is a new serum, and the customer loves it, they might come back and buy the full size. That's a second-order effect. The discount doesn't do that—it just reduces margin on the current purchase. Luna: So the takeaway for me is: birthday emails aren't a commodity tactic. If you invest in data collection, segment by recency, and use a gift instead of a discount, you can get a real lift. Did Luna & Sage see any negative effects—like customers waiting for their birthday to buy? Lucas: They checked for purchase delay. There was a small uptick in customers who typically bought every 45 days stretching to 50 or 55 days before their birthday. But the overall order frequency went up, so the net was positive. The delay was offset by the birthday purchase itself and the subsequent repeat. And they limited the birthday email to once per year, so it's not a recurring crutch. Luna: That makes sense. One per year is not enough to train customers to wait. So for a brand thinking about implementing this, what's the first step? Collect birthdates, obviously. Lucas: First step: add birthdate to your email sign-up form. Incentivize it with a small freebie. Second: set up a three-email flow in your email platform—teaser, offer, last call. Third: suppress recent purchasers—anyone who bought in the last 30 days. And test the free gift versus a discount. The beauty vertical loves this, but I think it translates to other categories too—pet, food, even apparel. Luna: I could see it working for subscription brands too, where the birthday gift could be an extra box or a free add-on. It's a moment of delight in an otherwise transactional relationship. Lucas: Exactly. It's one of those rare retention tactics that builds goodwill and revenue at the same time. And it costs almost nothing to set up. The ROI comes from the repeat purchases down the line. Luna: Alright, I'm convinced. Birthday emails are not just a nice to have—they're a real lever if done right. Thanks for digging into this one, Lucas. Lucas: Happy to. And for episode 100, it felt right to celebrate a simple, scalable win. Here's to many more episodes of retention marketing—and maybe a birthday email for each of them.