Track Record

45 tests.
8 months.
What actually moved.

What worked, what didn't, and what drove the numbers across a live email program over an 8-month engagement.

Headline numbers

The outcomes.

Prior to Nazoku. Verified against raw send data.

+186%
Click rate over 8 months. Click-through rate up +114% in the same period.
8-figure consumer platform
−99%
Unsubscribes. From ~2,200 per week to ~15 after rebuilding targeting and segmentation.
8-figure consumer platform
12% → <1%
Bounce rate after rebuilding list hygiene and suppression from scratch.
8-figure consumer platform
41.8%
Open rate on a non-promotional content series. 0.01% unsubscribe rate.
8-figure consumer platform
45
A/B and multivariate tests over 8 months. 97 variants across subject lines, CTAs, copy, and layout.
8-figure consumer platform
99.4%
Deliverability at program end. Started with critical inbox failures and a double-digit bounce rate.
8-figure consumer platform
Duration
8 months
Program
Lifecycle email
Tests run
45 tests, 97 variants
What drove it

The main levers.

List hygiene moved more than any copy test

Bounce rate was sitting at 9 to 12% at baseline. After building a proper suppression segment and excluding it from every send, it dropped under 2%. Unsubscribes went from ~2,200 per week to ~15. Deliverability hit 99.4%. Fixing the list is almost always the first thing to do, and it compounds everything else.

Bounce: 4.5% to 0.6%  ·  Deliverability: 99.4%

Outcome-framed CTAs outperformed action-framed ones

Changing a button from "Apply Now" to "Claim My Reward" lifted clicks ~37% at statistical significance. The reader pictures having the thing instead of doing a task. For ecommerce: "Get My Discount" or "Claim My Gift" over "Shop Now." Moving the CTA above the body copy got an additional +20% clicks at 96.5% confidence, replicated twice.

+37% from copy  ·  +20% from placement

Cut process copy. Keep value copy.

Removing explainer blocks and step-by-step descriptions lifted clicks 22 to 53% depending on how much was cut. But stripping too far hurt, an image-only email was the worst-performing variant tested. The rule: cut anything describing mechanics or steps, keep anything that removes doubt or signals the benefit.

+53.5% clicks on stripped layout

Who you send to matters more than what you send

Sends to recently engaged segments (opened in the last 90 days) hit 60 to 85% open rates. That outperformed every creative test in the program. Recency-based targeting is the highest-return variable in email. Get the segmentation right before touching copy or design.

60 to 85% open rates on engaged segments

Subject lines are a weak lever for open rate

Most subject line tests came back flat, urgency angles, mystery hooks, spelling out the offer value. Open rate is driven more by sender reputation and how recently the segment engaged than by the subject itself. When subject lines did move, emotional and curiosity framing beat urgency at over 95% confidence. One other thing worth testing: subject angle can affect click rate downstream, not just opens. The framing sets up how readers engage with the body.

No measurable effect

What didn't work.

Urgency in subject lines
Tested repeatedly across different angles. No reliable lift on opens. Emotional and curiosity framing consistently outperformed it.
Offer-stuffed CTA buttons
Adding the specific product or deal into the button copy produced no click lift. Outcome framing is what works, not specificity in the label.
One-column vs two-column layout
No meaningful difference. Over 60% of opens were on mobile where two-column collapses anyway. Not worth debating at the design stage.
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