THE SITUATION
Dr. Shiba had a solid list and a channel that had plateaued. Email generated 20% of total revenue and had stopped moving. A dozen automated flows existed, but they were broad and overlapping — subscribers received conflicting messages, fatigue was rising, and unsubscribe and spam-complaint rates were climbing with it. The email design carried no consistent brand identity. And the brand had trained its customers to wait for discounts, suppressing margin and delaying purchases.
The channel wasn’t broken for lack of effort. It was plateaued for lack of architecture.
THE GAP
A channel stuck at 20% with a dozen active flows isn’t an output problem — it’s a structural ceiling. Overlapping flows were actively destroying value: every duplicate send raised fatigue, pushed unsubscribes, and degraded deliverability for the engaged segment. Meanwhile, discount dependency meant the channel’s revenue came at a systematically reduced margin — customers were buying, but trained to buy only on sale. The brand was paying twice: once in lost engagement to flow chaos, once in eroded margin to discount conditioning.
THE ENGINEERING
The dozen overlapping flows were consolidated and restructured into a coordinated system segmented by purchase history, engagement level, and behaviour — so the right message reached the right customer at the right time, rather than everyone receiving everything. Overlap between automated flows and campaigns was eliminated so the subscriber experienced one coherent sequence, not several competing ones. This is the RE principle in its most direct form: a customer’s experience should be determined by where they actually are in their relationship with the brand, not by which flows happen to be switched on.
Generic, inconsistent email design was replaced with a single branded system — consistent identity, mobile-first, built around clear conversion-focused structure rather than decoration. In RE terms, design coherence isn’t aesthetic; it’s a retention lever. A customer who recognises and trusts the sender engages more and stays longer.
The hardest and most valuable component. Rather than continuing to drive sales through price cuts, the system was rebuilt around product value, education, and proof — benefit-led messaging, customer success stories, and educational sequences that helped customers understand and get more from what they bought. This is the brand-equity thesis at the centre of Retention Engineering: customers who buy because they value the product are worth more over their lifetime than customers trained to wait for a code.
THE RESULTS
Revenue within 90 days
Email revenue contribution grew from 20% to 42% of total revenue within 90 days
A 50% increase in email revenue within the first 45 days
Contribution held above 35% for the 18 months that followed — the proof that the system compounded rather than spiked
Engagement rates rose; unsubscribe and spam-complaint rates fell
Revenue growth achieved while reducing reliance on discounting — higher contribution at healthier margin
A channel that had plateaued at 20% reached 42% in 90 days — and stayed above 35% for the next 18 months.
FULL VIDEO TESTIMONIAL
Marnie Jaranilla, Dr Shiba — full video testimonial
