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 a couple of weeks ago, I was going through some old split-test data from a B2B software company, and one test just jumped out at me. They had a cold email campaign, and the control subject line was pretty standard: 'New White Paper: The State of Remote Work in 2026.' Luna: Yeah, that's the kind of subject line I'd probably delete without opening. It's informative, but it's also... flat. Lucas: Exactly. So they tested a version that was just a question: 'Is your team really ready for remote work?' And that version got a 47 percent higher open rate. Not a tiny bump, 47 percent. Luna: Wow. But that seems like a pretty obvious question. What made it work so well? Lucas: It's not just that it's a question. It's the kind of question. It taps into a specific pain point, and it leaves an open loop. Your brain wants to close it, so you click to get the answer. It's the same reason people can't stop watching a cliffhanger. Luna: Right, the curiosity gap. But is it that simple? Just add a question mark and watch your open rates soar? Lucas: No, not at all. That's the trap. I've seen plenty of tests where a question subject line underperformed. The key is that the question has to be relevant, specific, and it has to create a genuine information gap. If it's too vague or too generic, it feels like clickbait, and people ignore it. Luna: Can you give me an example of a question that would probably fail? Lucas: Sure. Something like 'Want to improve your business?' That's so broad it means nothing. It's almost a rhetorical question. But 'Is your team really ready for remote work?' implies there might be a gap between what you think and reality, and that's intriguing. Luna: So the question needs to create a little bit of anxiety, maybe. Lucas: A little, yeah. But not fear-mongering. It's more about challenging an assumption. And there's another layer: the question should be something the reader can't immediately answer with a simple yes or no. Luna: Because if they can answer it in their head, they don't need to open the email. Lucas: Exactly. You want them to think, 'Hmm, are we? Actually, I'm not sure.' And that uncertainty is what drives the click. Luna: That's a good rule. So what about length? Are there any parameters there? Lucas: Shorter is usually better, especially on mobile. Most emails are opened on phones now, so if your question is a run-on sentence, it'll get cut off. But the real thing to watch is the subject line's 'front-loading.' You want the key words early. Luna: So 'Is your team ready' is better than 'In light of recent developments, is your team ready?' Lucas: Exactly. You've got about two to three seconds of attention. Don't waste it on fluff. Luna: What about using 'you' in the question? Does that make a difference? Lucas: Huge difference. Questions with 'you' or 'your' usually outperform those without, because they feel personal. It's directed at me, not at some general audience. Luna: So 'Is your team ready' vs. 'Is the team ready' — the first one is probably stronger. Lucas: Right. And there's a specific type of question that's been studied a lot: the 'negative question.' Like 'Are you making this costly marketing mistake?' That one works because it taps into loss aversion. Luna: But we've done an episode on negative headlines before. Is this a different angle? Lucas: It's related, but here we're looking specifically at the interrogative form. Headlines can be negative without being questions. But when you combine the two, you get a double whammy: the negativity gets your attention, and the question keeps it. Luna: Makes sense. So what's a practical framework for writing a question subject line that actually works? Lucas: I'd say start with your audience's biggest pain point. Then phrase it as a question that implies they might not have it fully solved. Keep it under ten words. And make sure the answer isn't obvious. Luna: And then test it against a control, right? Lucas: Always. One test doesn't prove anything, but in this case, the question beat the control across multiple segments. And the open rate wasn't the only metric that improved. The click to open rate was higher too, which suggests the audience wasn't just curious — they were actually interested. Luna: That's a nice bonus. It's not just about getting opens; it's about getting the right opens. Lucas: Exactly. And that brings up an important point: a question subject line can also act as a pre-qualifier. If someone opens because they're genuinely worried about their remote work setup, they're more likely to engage with the content. Luna: So it's not just about curiosity — it's also about relevance. Lucas: Right. The curiosity gap has to be planted in soil that's already fertile. Luna: Speaking of fertile soil — if today's episode gave you a new idea for your next email campaign, that's the kind of thing that makes this podcast worth supporting. Lucas: Yeah, we keep this show ad-free because of listeners who chip in. If you found this useful, you can buy us a coffee at buy me a coffee dot com slash fexingo. It's a small thing that keeps these conversations going. Luna: And we genuinely appreciate it. Lucas: So back to subject lines. One more thing I've noticed: questions work best when they're used sparingly. If every email in a campaign has a question subject line, it loses its punch. It becomes a pattern, and patterns get ignored. Luna: So you're saying don't make it a formula. Lucas: Right. Use it when you have a genuine question to ask. If you force it, the audience will sense it. Luna: But when you do it right, it can be a powerful tool. I remember reading about a small e-commerce brand that used a simple 'What's your favorite color?' subject line for a survey, and their open rate was something like 60 percent. Lucas: That's a great example, because it's almost too simple. But it works because it's playful and it invites interaction. Luna: So the lesson is: ask a question that your reader actually wants to answer. Lucas: And make sure it's a question you're prepared to answer in the email. If you ask 'Is your team ready?' and then the email just pitches a product without addressing that question, you'll lose trust fast. Luna: That's a good point. The question is a promise, and you have to keep it. Lucas: So next time you're writing a subject line, try turning it into a question. But do it with care: make it specific, make it personal, and make it honest. That's what turns a simple question into a powerful one. Luna: And if you want to see more examples, we'll link to some in the show notes. For now, I'm curious — what's a question you've received in your inbox that actually made you click? Lucas: That's a great question for the listener. I'd love to hear about it. But for now, I'm Lucas. Luna: And I'm Luna. See you next time. Lucas: Bye.