Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / Why a Handwritten Margin Note Beat a Digital A-B Test
Transcript
- Lucas: There's this experiment from last year that I keep coming back to. Direct-response agency Zerocopy ran a split test on a sales email for one of their clients — a B2B software company. Luna: Okay, I'm guessing this isn't about subject lines or body copy. Lucas: Not exactly. The control was a standard, well-written email. Nothing fancy. The test was the exact same copy, but they added one thing — a handwritten margin note, scanned and embedded as an image. Just a few words scrawled in the left margin, like 'This is the part that really matters.' Luna: And what happened? Lucas: Click-through rate went up 27 percent. Conversion rate went up 19 percent. Same copy. Same offer. The only difference was a handwritten note that looked like someone had physically marked up the email before sending it. Luna: That's wild. But also — I'm not entirely surprised. There's something about seeing handwriting in a digital medium that signals effort. Lucas: Exactly. The term in behavioral economics is 'effort signaling.' When you see that someone took the time to handwrite something, your brain interprets it as a sign that they care. And if they care, they're probably trustworthy. Luna: It's like the opposite of spam. Spam feels automated. This feels human. Lucas: Right. And there's a precedent for this. In the 1960s, a researcher named Leonard Bickman did a study where he left typed letters in public places with either a typed correction or a handwritten correction, and people were significantly more likely to mail the letter with the handwritten correction because they assumed the sender was more invested. Luna: So the mechanism is decades old. We just forgot about it when everything went digital. Lucas: Pretty much. But here's the catch — and this is where it gets interesting for copywriters. In the Zerocopy test, the note wasn't just any note. It was specific to the content. It said something like 'This is the part that really matters.' It wasn't generic like 'Read this.' Luna: So the specificity matters too. If it's a generic note, it feels performative. If it's specific, it feels like a genuine recommendation from one human to another. Lucas: That's the nuance. And this is where a lot of people would mess it up. They'd add a handwritten note to every email, and then it becomes just another template. The effect only works when it's unexpected. Luna: Yeah, if every email has a margin note, the brain stops registering it as effort. It becomes noise. Lucas: Which is why the most effective use case is for high-stakes emails — like a sales follow-up after a demo, or a proposal. Something that the recipient knows took effort on your part already. The handwritten note amplifies that. Luna: So the lesson isn't 'add handwriting to everything.' It's 'add handwriting to the moments where you want to signal extra care.' Lucas: Exactly. And the copy itself still has to be good. The note didn't save bad copy — it amplified good copy. The control was already a solid email. Luna: That's a key point. The handwriting is a multiplier, not a substitute. Lucas: Right. And let's talk about execution. The note was scanned as an image, which means it loads as a graphic. That introduces a technical risk — if images are blocked, the recipient might not see it. But Zerocopy tested that too, and even with images off, the subject line and preview text still carried the email. The image just added a lift when it was visible. Luna: So it's a low-risk, high-reward tweak. As long as the email works without it. Lucas: Exactly. And there's another layer — the handwriting itself matters. It has to look authentic. If it looks too neat, like a font, it loses the effect. It has to look like a real person wrote it with a real pen. Luna: So messy is better. Scrawled, not calligraphed. Lucas: Messy is better. And ideally, it's in a contrasting color — blue or red ink on a white background — so it stands out. The visual contrast signals that this is an addition, not part of the original design. Luna: You know, this reminds me of something I read about direct mail from the 1980s. Some of the highest-converting mailers had handwritten envelopes. Not typed, not printed — handwritten. Lucas: Same principle. The envelope gets opened because it looks personal. We've just rediscovered that in a digital context. Luna: It makes you wonder what other analog tactics are sitting there, waiting to be digitized. Lucas: I think about that a lot. The thing is, not everything scales. Handwriting doesn't scale — you can't automate a genuine margin note. But for the emails that matter most, it's worth the extra thirty seconds. Luna: And honestly, that's a good filter. If you can't be bothered to write a note for that email, maybe the email isn't that important. Lucas: Interesting. That flips the question from 'should I add a note?' to 'is this email worth a note?' If the answer is no, maybe rethink the email itself. Luna: Yeah, that's a solid heuristic. Lucas: Look, if this kind of practical, data-backed marketing talk is something that's helped you sharpen your own writing, and you've found yourself applying it — maybe you've even tested a handwritten note in an email and seen it work — that's exactly the kind of thing we love hearing about. And if you value what we do here, the simplest way to support the show is at buy me a coffee dot com slash fexingo. No pressure, just a way to keep these conversations ad-free. Luna: Yeah, it's a small gesture that makes a big difference for us. And we really appreciate it. Lucas: Anyway, back to the margin note. One thing Zerocopy noticed in their debrief was that the handwritten note didn't just lift clicks — it also reduced unsubscribes. The email with the note had a lower opt-out rate. Luna: That makes sense. If the note makes the email feel more personal, people are less likely to perceive it as spam. Lucas: Right. So the effect isn't just on the action you want — it's on the relationship. It signals that you're not just blasting emails, you're actually writing to them. Luna: Which is ironic, because it's still part of an automated campaign. But the illusion of personal touch works. Lucas: It's not an illusion if it's real. You are actually writing that note. It just happens to be scanned and embedded. The recipient knows it's a scan, but they also know a human wrote it. Luna: Fair point. So the authenticity is real, even if the delivery is digital. Lucas: Exactly. And I think that's the takeaway for anyone listening. You don't need to overhaul your copy. You don't need a new funnel. You just need to find one touchpoint where a small, human gesture can cut through the noise. Luna: One question — does this work for B2C as well as B2B? Or is it more effective in one context? Lucas: Good question. Most of the data I've seen is from B2B, but the psychology is universal. I'd guess it works best in high-consideration purchases where trust is a factor. For a low-cost impulse buy, a handwritten note might feel out of place. Luna: So it's about matching the medium to the message. Handwriting says 'I took time for you,' which is appropriate when the transaction is meaningful. Lucas: Exactly. And that's the art of copywriting — knowing which tool to use and when. The margin note is a tool. Like any tool, it's only effective in the right hands. Luna: Alright, so next time I get a sales email with a margin note, I'll know exactly what they're doing. Lucas: And you'll probably click it anyway. Because it works. Luna: Yeah, I probably will.