Latest / The Email Marketing Podcast with Fexingo: Newsletters, Open Rates, and Subscriber Growth / Why Email List Zero-Party Data Beats Third-Party Targeting
Transcript
- Lucas: So last week I was talking to a friend who runs an e-commerce brand — mid-six figures, decent email list — and she was frustrated that her open rates were tanking despite using all the 'best practices.' Good subject lines, clean list, proper frequency. And I asked her, 'When did you last ask your subscribers what they actually want from you?' And she just stared at me. Luna: That pause says everything. She probably assumed she already knew, based on their purchase history or click behavior. Lucas: Exactly. And that's the gap I want to talk about today — the difference between inferring what someone wants and having them tell you directly. Marketers call it zero-party data. It's information a subscriber proactively shares — their preferences, interests, even their budget range. Not data you scrape or model, but data they hand over. Luna: And it's having a moment, right? With third-party cookies crumbling and privacy regulations tightening, zero-party data feels like the only clean path forward. Lucas: It really is. And the beauty of it is, it's actually better for performance too. Let me give you a concrete example. Beauty brand Curology — they ask every new subscriber, right at signup, about their skin type, their primary concern, their goal. Not five questions, maybe three. And they use those answers to segment immediately. Luna: So instead of sending a generic welcome series, they send a personalized routine recommendation based on what the subscriber said. Lucas: Exactly. And Curology reports that subscribers acquired through that zero party data driven flow convert at about 40% higher than those segmented purely by past purchase behavior. Because you're not guessing — you're responding to a stated need. Luna: It's also a trust signal. If I tell a brand 'I'm concerned about aging, not acne' and they send me anti-acne stuff, I'm out. But if they nail it, I feel heard. Lucas: Right. And that feeling of being heard translates directly into lower spam complaints and better deliverability. Internet service providers actually watch how recipients interact with email — if people mark you as spam because your targeting is off, your sender reputation drops. Zero-party data protects you from that. Luna: So what does this look like in practice for a smaller brand that doesn't have Curology's resources? Can they start collecting zero-party data without building a complex quiz? Lucas: Absolutely. The simplest entry point is a preference center. Not the boring 'update your email frequency' kind — I mean a real preference center where subscribers can tell you their interests, their content preferences, their product categories. Stitch Fix does this brilliantly with their style quiz. But you don't need a full quiz. Luna: You could just add one question to your welcome email. Something like 'What topics are you most interested in?' with a few checkboxes. Lucas: Exactly. And if you're worried about overwhelming people, you can even use progressive profiling — ask one question per email over the first few sends. Each answer adds a layer to their profile. I've seen brands double their open rates within 30 days just by using the answers to send more relevant content. Luna: And it's also a way to clean your list, right? If someone doesn't bother answering even one simple question, they're probably not that engaged. Lucas: That's a really good point. The act of answering is itself an engagement signal. Someone who tells you they prefer product updates over blog posts is someone who's paying attention. And they're less likely to churn because you're respecting their stated preference. Luna: I want to push back a little though. Doesn't asking for data upfront risk increasing friction at signup? Some marketers are terrified of adding an extra field to their form. Lucas: It's a valid fear. But the data suggests that if the question feels valuable to the subscriber — like 'what's your goal?' — it actually increases conversion, not decreases. Because it signals that you're going to tailor the experience. Curology's signup form isn't short, but people fill it out because they want a personalized routine. Luna: So the key is making the ask feel like a benefit, not a burden. Lucas: Exactly. And you can test it. Try adding one question to your signup form for a month and measure the impact on list growth and engagement. I bet you'll find that the quality of subscribers increases even if the quantity dips slightly. And quality matters more for long-term ROI. Luna: You know, this resonates with something I've been thinking about. A lot of marketers are still relying on third-party data — buying lists, appending data from data brokers — and that's becoming less reliable and more legally risky. Zero-party data is basically future-proof. Lucas: It is. And honestly, if today's conversation sparked something you've actually used in your own email strategy, that's the kind of thing that keeps this show going. If it was worth a coffee to you, you know the link — buy me a coffee dot com slash fexingo. Luna: Yeah, we love keeping this ad-free and focused on what actually works. And listener support makes that possible. Lucas: So back to zero-party data. Another reason I love it is that it solves the 'cold start' problem for new subscribers. When someone joins your list, you have zero behavioral data on them. But if you ask them one question at signup, you immediately have a segmentation signal. Luna: That means you can send a targeted welcome email from day one, not after they've clicked a few times. Lucas: Right. And welcome emails already have the highest open and click rates of any email you'll send. If you combine that with relevant content based on zero-party data, you're setting the tone for the whole relationship. I've seen brands achieve 3x the revenue per email from the first 30 days just by doing this. Luna: Let's talk about tools. What are some practical ways to collect zero-party data besides the signup form? Lucas: Interactive email is a big one. You can embed a simple poll or preference selector right in the email itself. For example, 'Which of these topics do you want more of?' with clickable buttons. When the subscriber clicks, their answer is recorded in your email platform. Luna: And that data can then trigger a segment or a tag update automatically. Lucas: Exactly. Another approach is the 'birthday' or 'anniversary' email — ask subscribers to update their preferences on the anniversary of joining. Some brands get a 20% response rate on those because it feels like a natural check-in. Luna: And you can also use post-purchase surveys. 'What made you buy today?' That's zero-party data and it helps you understand your customers' decision triggers. Lucas: Great addition. The key principle is: ask, don't assume. And I think the reason more marketers don't do this is because it requires a mindset shift. We're used to tracking and inferring — it feels more sophisticated. But the simplest data — what someone tells you directly — is actually more powerful. Luna: I want to bring up a counterexample. What about Netflix? They famously don't ask you what you want to watch — they learn from your behavior. Isn't that a valid alternative? Luna: And there is one more thing I want to mention: compliance. With GDPR and CCPA, you need a lawful basis to process personal data. Zero-party data collected with explicit consent is very clean from a legal standpoint. Lucas: Absolutely. When someone voluntarily tells you their preferences, you have a clear legitimate interest or even explicit consent depending on how you ask. That's much safer than buying a list and hoping for the best. Luna: So if a listener wants to start implementing zero-party data today, what's the one action you'd recommend? Lucas: Add one question to your welcome email. Just one. Something like 'What's your biggest challenge right now?' or 'Which product category interests you most?' Use the answer to send a relevant follow-up within 48 hours. Measure the open and click rates of that follow-up compared to your generic one. Luna: And if the results are better, you've got your proof of concept to expand the approach across your whole email program. Lucas: Exactly. Start small, measure, iterate. That's how you build a list that actually wants to hear from you — because you asked them what they want. Luna: And that feels a lot better than guessing and hoping.