Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / How a Single Question in the Subject Line Lifted Open Rates
Transcript
- Lucas: So there's a two-word question that, in a recent B2B email campaign, lifted open rates by 68 percent. And it's not 'are you' or 'can you' — it's something that sounds almost too simple to work. Luna: Okay, I'm already curious. But before you tell me, what was the context? Was this a cold list or a warm one? Lucas: Warm list, but a notoriously tough segment — mid-level managers at logistics companies, people who get a hundred emails a day. The agency ran a split test on the same email, same body, same preview text, only the subject line changed. Luna: And the winner was a question? I mean, we've talked about curiosity gaps before, but what was the exact wording? Lucas: The subject line was 'Still using spreadsheets?' — five words, ends with a question mark. The control was 'Stop using spreadsheets' — a command, very direct. The question version beat it by 68 percent on open rate, and the reply rate doubled. Luna: That's wild. But why would a question outperform a clear benefit? I mean, 'stop using spreadsheets' tells you exactly what you'll get. Lucas: Right, and that's the paradox. A command gives you the answer; a question leaves it open. The brain hates an unfinished loop. When you read 'Still using spreadsheets?' you subconsciously supply your own answer — 'yeah, actually, we are, and it's a pain' — and now you need to know what they're offering. Luna: So it's not just about being clever — it's about making the reader do a tiny bit of work that pays off. That's like the Zeigarnik effect, isn't it? Lucas: Exactly. Zeigarnik found that people remember incomplete tasks better than completed ones. An open question is an incomplete loop. Your brain wants to close it. In email, the only way to close it is to open the email. Luna: Okay, so if someone finds this useful — and I'm guessing some of our listeners have already opened a notebook — the way we keep these episodes ad-free is through listener support. If today's conversation sparks something you try in your next campaign, you can keep that going at buy me a coffee dot com slash fexingo. Lucas: Yeah, it really does help us keep the lights on without selling out to ad networks. But back to the question tactic — it's not just about the wording, it's about knowing your audience's internal monologue. Luna: Right, because 'still using spreadsheets' works for a logistics manager, but would it work for, say, a creative director at an ad agency? Lucas: Probably not with the same framing. The power of a question is that it mirrors the reader's own doubt. You have to know what they're already asking themselves. For a creative director, it might be 'Is your portfolio working as hard as you are?' or 'Your last campaign was great — what's next?' The question has to feel like it's coming from inside their head. Luna: And there's a fine line between a question that piques curiosity and one that feels like a trick. Like, 'Do you want to save money?' is so generic it's invisible. Lucas: Yeah, generic questions are just noise. The specificity is what makes the brain stop. 'Still using spreadsheets?' is specific enough that the former spreadsheet user feels seen. It's not a hypothetical — it's a nudge to their current reality. That's why it works better than 'Stop using spreadsheets' — the command implies you know what's best for them, while the question respects their autonomy. Luna: Autonomy — that's a big one. Questions put the reader in control. They're not being told what to do, they're being invited to decide. Lucas: And there's some solid behavioral science behind that. In one study, participants who were asked 'Will you volunteer?' were more likely to help than those told 'You should volunteer.' The act of answering — even silently — creates commitment. In email, the commitment is tiny: you just have to click. But it's still a choice, and we value things we choose more. Luna: So how does this translate to other channels? I've seen question headlines in blogs and even on landing pages. Does it scale beyond email? Lucas: It does, but the stakes are different. In email, the question has to fit in a subject line — you have maybe 40 characters to land it. On a landing page, you have more room, so you can build a longer question that sets up a bigger curiosity gap. But the principle is the same: you're creating a loop that only your content can close. Luna: Have you tested this yourself? Or are you just citing other people's data? Lucas: I've done a few A/B tests with clients, and the pattern holds — but with a caveat. It works best when the audience already has a problem they're aware of. If they don't know they have a problem, a question might just confuse them. For a cold list, a more direct benefit often wins. The question tactic is for warm or semi-warm audiences. Luna: That makes sense. So the 'still using' framing is basically a pain-point question — it assumes they already feel the pain. But what if they think their spreadsheets are fine? Then it falls flat. Lucas: Exactly. And that's why you need to segment your list. If you're targeting the spreadsheet-savvy but frustrated, you win. If you're targeting the spreadsheet-loyal, you might need a different angle — like 'The tool that makes spreadsheets obsolete' — still a question, but it challenges their status quo. Luna: So would you say the question mark is the most powerful punctuation in copywriting? Or is it more about the words around it? Lucas: I'd say the words matter more than the symbol. A question mark on a boring statement doesn't save it. But when the words are right, the question mark is like a hook that catches the eye. In subject lines, it also changes the tone — it feels more conversational, more like a colleague asking something than a marketer announcing something. Luna: And that conversational tone is something we've talked about before — it lowers the reader's guard. A question doesn't feel like an ad; it feels like a text from a friend. Lucas: Right. And there's a reason why 'still using' is such a strong opener. It's an adverb that implies time passing — you've been doing this for a while, and maybe it's time for a change. It's a gentle nudge, not a shove. 'Still using' is also a bit of a hidden challenge — it suggests you might be behind the times, but not in an aggressive way. Luna: So it's a passive-aggressive question, but in a good way. Lucas: Ha, exactly. Now, one mistake I see people make is using a question that has an obvious 'no' answer. 'Do you want to lose weight?' — of course, but that doesn't create tension. A better question is one that forces them to confront their current behavior: 'Are you still skipping breakfast?' That's a bit uncomfortable, and it's that discomfort that drives action. Luna: So the best questions are slightly uncomfortable, but not accusatory. There's a sweet spot between curiosity and guilt. Lucas: Yes, and that's the craft. You're not shaming them, you're just holding up a mirror. 'Still using spreadsheets?' works because it's a tiny bit of a dig, but it's also relatable. Everyone's been there — you know you should move on, but you haven't. The question validates that feeling and offers a way out. Luna: Let's talk about the preview text. In that test, did they change the preview text too? Because that can affect open rates almost as much as the subject line. Lucas: Good catch — they kept the preview text the same across both versions. But the preview text was also a question: 'Curious how your peers are handling it?' So the subject line asked one question, the preview text asked another, and together they created a double loop. That's a powerful combo. Luna: So the lesson is to use questions in both places, but they should be different questions that build on each other. Lucas: Exactly. The subject line creates the initial curiosity, the preview text deepens it, and then the email opens with a third question — maybe 'Here's what the data says' — to keep the momentum going. It's like a trail of breadcrumbs. Luna: I want to talk about the reply rate doubling. Why would a question in the subject line lead to more replies, not just opens? Lucas: Because it sets a conversational tone. When you open with a question, the reader is already in an answering mindset. So when they read the email and it ends with 'Does this sound like you?' — or even just 'Thoughts?' — they're more likely to respond. The subject line primes the pump. Luna: So it's not just about the open — it's about the whole engagement chain. That's a bigger win than a 68 percent open lift. Lucas: For sure. In B2B, a reply can turn into a meeting, and a meeting can turn into a deal. So the question tactic is really a relationship starter, not just a clickbait trick. Luna: Are there any industries where this has backfired? Lucas: I've seen it struggle in highly regulated fields — finance, legal, healthcare — where the audience expects a certain formality. A question can feel too casual or even evasive. But that's not to say it never works; you just have to calibrate the tone. 'Are your compliance processes audit-ready?' is a question, but it's formal enough to work in that world. Luna: So it's about matching the question to the audience's expectations, not just the general principle. Lucas: Right. And one more thing — the timing. Questions are more effective when you've already established some credibility. If you're a stranger, a question can feel like a probe. If you're a known expert, a question feels like a thoughtful insight. So on a warm list, you're in the sweet spot. Luna: So what's your advice for someone who wants to try this tomorrow? What's the first step? Lucas: Pick one segment of your list, write a question that targets their specific pain point, and run a split test against your usual style. Keep everything else identical. And don't be afraid to make it a little uncomfortable — 'still' is a classic word for that. Test variations: 'Are you still...?' vs. 'Still...?' — the shorter might perform better on mobile. Luna: And watch the replies, not just the opens. That's where the real signal is. Lucas: Exactly. If you double your replies, that's a game changer. Even if the open lift is only 20 percent, the engagement lift is what matters. Luna: I love this. It's such a simple tweak, but it changes the entire psychology of the interaction. Lucas: And that's the fun of copywriting — the smallest changes can have outsized effects. A question mark is just a piece of punctuation, but in the right context, it's a lever that moves behavior.