My former optometrist sent me an email recently. The subject line incorporated many of the elements marketers consider to be important for getting an audience to stop and look. It was specific, personalized, and data-driven, and it certainly got my attention: “Your last eye exam was on 01/25/22.”
There was just one problem. That statement was completely inaccurate. I’ve actually had two eye exams in that office since 2022, but I did switch optometrists last year.
While the trained and credentialed medical professional who checked my eye health and vision was (and remains) excellent at her job, the sales people were pushy, all of the frames were hundreds of dollars more than I wanted to pay, and just retrieving my prescription—so I could take it to a more affordable online store instead—was more hassle than it should have been.
I started going there when it was part of a small regional chain. They had a reputation for being good, albeit pricey, but then it was acquired by a much larger national company, changed its name, and slowly began evolving away from the experience I had known. Finding a new doctor of any kind is never fun, but I felt I had to take that step.
Unfortunately, the national chain’s CRM and email marketing team didn’t know any of that. I’m not sure why it’s incorrect about my last visit. But the system says I haven’t been back in a while—which is true—so that triggered an outreach message built on a number of assumptions.
Dynamic Personalization
In email marketing, this tactic is called dynamic personalization, or sometimes behavioral personalization. Anytime a CRM pulls from your data—your appointment history, purchase dates, or account activity—it falls under the umbrella of trigger-based marketing. The broader play is a win-back campaign: identify lapsed customers, surface a specific data point, and use that specificity to create urgency.
When it works, it really works. “You haven’t ordered coffee in 30 days” hits differently when you have been meaning to reorder and just forgot. The specificity creates a jolt of relevance that generic subject lines can’t match.
There’s a reason marketers invest in these systems.
The Problem with Confidence
Specificity raises the stakes. A vague “Time for a checkup?” is easy to ignore and just as easy to forgive. It makes no claims and carries no risk. “Your last eye exam was on 01/25/22” is a different animal. If that date were accurate, I’d certainly feel a sense of urgency about scheduling my next exam.
But that approach also makes a claim, and if the recipient knows that such a claim is false, or at least not quite right, the sender loses all credibility.
I suppose it’s the marketing equivalent of confidently calling someone by the wrong name. The personalization that was supposed to demonstrate attentiveness instead exposes the distance between what the company thinks it knows and what’s actually true.
The people most likely to notice the error are the people who already stopped being your customer for a reason. They didn’t drift away from neglect. They made a conscious decision to go elsewhere for that service. Reminding them of the last time they interacted with you doesn’t reopen a door, but it does remind them why they closed it.
What This Means for Campaigns
This does not make personalization a bad idea, but personalization requires more care than the tools make it seem.
A CRM tracks what has happened inside your ecosystem. It doesn’t know much about what your customer did after they stopped being your customer. A “last purchase” or “last interaction” in your system is not the same as “last purchase, period.” Build your messaging around what you can confirm, and be careful about trying to glean too much from silence. You have a tiny window into that customer’s world. You do not have the full picture.
Specificity in messaging is sometimes a risky commitment. The more specific the claim, the more trust you’re putting on the line. If you’re going to cite a date or a behavior, make sure the conclusion you’re drawing from it is airtight. If it’s not, you’re better off with something broader and softer.
Of course, tone can play a role in how an outreach effort lands. Sometimes getting the tone right is more important than whatever data your CRM provides. “We’d love to see you again” respects the recipient’s autonomy. “Your last eye exam was on 01/25/22” presumes you know the recipient’s current situation (you don’t). It also carries implied judgment. You might as well ring your bell through the town square while shouting, “Shame! Shame! Shame!”
I’m not sure who would respond positively to that approach. The difference between invitation and assumption can determine whether your email gets a click or an unsubscribe.
Personalization is an effective tool in email marketing, but you must precisely wield it. The goal isn’t to show customers how much data you have about them. You want them to understand what they need, and how you can help—and that requires knowing the limits of what the data can actually tell you.
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