You are working through your lifecycle emails, deciding which ones deserve a testimonial, and you reach the re-engagement email — the message you send to a user who signed up, poked around, and then went silent for weeks. The subject line is some version of "we miss you," and the instinct that adds a glowing quote to a landing page whispers that maybe a testimonial will remind this drifting user what they are missing. But the person reading a re-engagement email is not a stranger deciding whether to trust you. They are someone who already tried your product and, for some reason, stopped. That history changes everything about what a testimonial does here. Before you drop a customer quote under the "come back" button, it is worth asking what actually made this person go quiet.
Who is reading a re-engagement email
Here is the fact that changes the decision: a dormant user is not unconvinced — they are unactivated, distracted, or quietly disappointed. They gave your product a look and something stalled: they never hit the moment where it clicked, life got busy, or the product did not do the one thing they came for. Their unanswered question is not "is this any good," which a testimonial addresses; it is "is it worth my time to come back and try again." A generic quote praising the product answers the wrong question, and worse, it can read as if you did not notice they already gave you a chance and it did not stick.
That mismatch is the core risk. A testimonial that says "This tool changed how our team works" is written for someone who has never logged in. Your dormant user has logged in, saw whatever they saw, and left — telling them how great other people find it can feel like being sold a product they already have sitting unused in a tab. It skips over the real obstacle, which is not belief but momentum. The same misfire as a chirpy quote dropped into a dunning email: true, warm, and aimed at a decision the reader already made.
The narrow case where it helps
There is one genuine exception, and it is specific: a testimonial from someone who was in the same stalled place and broke through. Not "great product," but "I almost gave up in the first week until I set up the one report — now I run it every Monday." That kind of proof works because it speaks directly to the dormant user's actual situation. It says, in effect, "someone like you got stuck exactly where you are and here is what got them unstuck." It reframes the return not as trying an unproven thing again, but as finishing something they started.
The pattern that works is outcome-and-obstacle specific, tied to the exact moment users tend to drift. If your data shows people go quiet before they build their first project, a one-line quote about how quick the first project turned out to be lands with a reader who stalled right there. This is the same discipline behind placing a single result-anchored testimonial in a cancellation flow: proof aimed at a specific doubt, not proof sprayed at a general audience.
Why it usually gets in the way
For most re-engagement emails, a generic testimonial fails in two ways. The first is it ignores the reason they left. Re-engagement works when it feels personal and low-friction: here is what is new since you left, here is the one thing worth two minutes, here is a direct path back to where you stopped. A stranger's praise competes with that and adds nothing the dormant user needs. They do not lack endorsement; they lack a reason and an easy on-ramp. A quote gives neither.
The second is tone collision with a mildly awkward moment. A "we miss you" email is already delicate — you are acknowledging the customer drifted away, and there is a faint risk it reads as needy. Adding a glowing quote can tip it from "here is something useful, come see" into "everyone loves us, why don't you." That can push a wavering user further off rather than pulling them back. The language patterns that make a testimonial sound staged are especially costly here, because a skeptical, already-drifted reader is the harshest possible audience for anything that smells like marketing.
What to put in the email instead
If your re-engagement email has room and you want it working harder, aim at the dormant user's real state — someone who started, stalled, and needs a reason plus a frictionless way back. The highest-value elements are practical: a specific "here is what changed since you left" if something genuinely did, a single concrete next step sized to a couple of minutes, a link that drops them back exactly where they stopped rather than a generic login, and an honest acknowledgment that their time is worth respecting. These serve the person deciding whether to re-open the tab.
If you do use proof, make it the obstacle-specific kind described above — a short line from a customer who stalled where this user stalled and broke through — placed after the reason to return, never ahead of it. This is the same restraint as featuring one testimonial on a paywall or upgrade screen: a single, well-targeted piece of proof supports the ask instead of drowning it.
The rule of thumb
Ask what made this user go quiet. On a re-engagement email the honest answer is almost never "they did not believe the product was good" — it is "they never got to the moment it paid off, or life pulled them away." So the email needs a reason to return and an easy path back, not a stranger's endorsement of a product they already tried. Reserve proof for the one form that changes behavior: a short, obstacle-specific line from someone who was stalled exactly where this user is and got moving. Save the general praise for the pages where genuinely new prospects still live.