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Retention & Lifecycle

The ecommerce retention agency measuring what email and SMS actually add

Lifecycle flows segmented by real behaviour, deliverability managed rather than assumed, and holdout groups that separate incremental revenue from the revenue your platform takes credit for.

  • Holdout testing within segments: incremental, not attributed
  • Deliverability fixed before content, because spam placement wastes both
  • SMS with its own strategy, not a duplicate of the email calendar
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Why it matters

Retention is where ecommerce economics are decided

Retention is where ecommerce economics are decided. Acquisition costs have risen steadily across paid channels, and a brand whose customers buy once is left buying every sale at full price, whether through Shopify PPC or a wider ecommerce marketing programme. A brand whose customers buy three times has a fundamentally different business, and usually a fundamentally different tolerance for acquisition cost. Most email and SMS retention programmes we inherit have plenty of flows. What they are missing is segmentation that reflects what customers have done, testing beyond subject lines, deliverability hygiene, and any measurement of whether the revenue being credited to email would have arrived anyway.

That last point matters more than it is usually given credit for. Retention platforms attribute generously by design, and abandoned cart flows in particular take credit for a great deal of purchase intent that already existed. Holdout testing is the only way to see the difference, and the difference is often large enough to change where you would spend the next pound. We would rather run six well-segmented, properly tested flows with clean deliverability than twenty that were built once and never revisited. Purchase frequency and replenishment behaviour vary enormously by category, so the programme should reflect your own cycle. It works best alongside the Shopify CRO work that converts the first order, and inside the full-funnel plans our Shopify marketing agency and growth marketing teams run.

What we usually find

The patterns behind a retention programme that has plateaued

Almost never a shortage of flows. Nearly always segmentation, deliverability, and measurement.

  • Flows that treat every customer identically

    The same welcome series to a bargain hunter and a high-value repeat buyer, the same winback to someone who bought once and someone who bought eight times. Segmentation by behaviour is the difference between a flow and a broadcast.

  • Deliverability quietly degrading

    Sending to unengaged contacts to keep reach numbers up, until inbox placement falls and your engaged customers stop seeing you too. This is usually discovered months after it starts.

  • Open rates still being used as a metric

    Apple's Mail Privacy Protection inflates opens for a large share of consumer email. Reporting on them is misleading; triggering automation off them is actively harmful.

  • SMS used as a second email channel

    The campaign calendar duplicated to SMS, at much higher cost and much lower tolerance for irrelevance. SMS unsubscribes are effectively permanent.

  • Attributed revenue reported as incremental

    Retention platforms credit purchases that would have happened regardless, particularly in high-intent flows. Without holdouts nobody can say what the programme actually added.

  • Subscription churn in the first three cycles

    Usually caused by cadence mismatch, unexpected charges, or an inflexible management experience rather than the product. Discount save offers mask it and train deliberate churn.

Scope

Email and SMS retention: what we run

Email, SMS, loyalty, and subscriptions as one lifecycle programme, on one calendar. Scope varies by list size and channel mix.

  • Lifecycle flow architecture

    Welcome, abandoned checkout, abandoned cart, browse abandonment, post-purchase, winback, replenishment, back-in-stock, and review requests, segmented by behaviour and purchase history.

  • Segmentation strategy

    Segments built on what customers have done (value, frequency, category affinity, engagement recency) rather than on when they signed up.

  • Campaign calendar and content

    A planned calendar aligned to trading, launches, and seasonality, with sending volume managed against engagement. Email and SMS content is written in your brand voice, working from your guidelines and assets.

  • SMS programme

    Time-sensitive, high-value messaging with its own strategy, separate from the email calendar, and compliance handled properly.

  • Deliverability management

    Authentication with SPF, DKIM and DMARC, a sunset policy for unengaged contacts, engagement-based sending, bulk sender requirement compliance, and inbox placement monitoring.

  • Holdout testing and repeat-rate reporting

    Randomised holdouts within segments to measure what the programme adds. Reporting covers repeat purchase rate, time between orders, and revenue per recipient by flow and segment, alongside the platform's attributed figures and an explanation of the gap.

  • Structured testing

    A test plan on offers, timing, segmentation, and content, measured on conversion and revenue per recipient, with results and decisions recorded.

  • Subscription retention

    First-three-cycle churn analysis, churn reported by cycle, cadence flexibility, pause and skip options, and pre-billing notification, before reaching for discount save offers.

  • Loyalty programme design and list growth

    Loyalty structures that reward the behaviour you want. List capture that does not damage the on-site experience, with the offer and timing tested.

  • Platform migration

    Moves between retention platforms with flow logic, segments, historical data, and deliverability reputation carried across deliberately.

First call

What you get on the first call

Do you know how much of your email revenue is incremental? Most brands do not, because the platform reports attributed revenue. A holdout answers it, and the gap is usually larger than expected.

Book a Call

  1. A look at your current flows

    We go through the flows you already run and how they are segmented.

  2. A deliverability check

    A look at your deliverability, because improving content that lands in spam achieves nothing.

  3. A read on incremental revenue

    An honest read on where the incremental revenue is, as distinct from the attributed revenue your platform reports.

Process

How we take over a retention programme

  1. Step 01

    Programme audit

    Existing flows, segments, sending patterns, deliverability health, and platform configuration. Plus the commercial baseline: repeat purchase rate, time between orders, and customer value distribution.

  2. Step 02

    Deliverability remediation

    Authentication, sunset policy, and engagement-based segmentation. Done first, because improving content that lands in spam achieves nothing.

  3. Step 03

    Segmentation and core flow rebuild

    Behavioural segments reflecting value, frequency, category affinity, and engagement, then the six flows that carry most of the revenue, properly segmented, with content written in your voice.

  4. Step 04

    Measurement and testing

    Holdout groups established within segments so incremental revenue can be distinguished from attributed revenue from the start. Structured testing follows on offers, timing, segmentation, and content, measured on conversion and revenue per recipient.

  5. Step 05

    SMS expansion and ongoing optimisation

    SMS introduced with its own strategy where the economics support it, alongside loyalty or subscription work where relevant. Then campaign calendar execution, flow iteration, deliverability monitoring, and periodic holdout re-measurement as the programme changes.

How we differ

Two ways to run retention

The right-hand column is the standard model. It produces good-looking reports and makes it hard to know what is actually working.

  • Primary metric

    How we work
    Repeat purchase rate and incremental revenue
    Typical retention management
    Open rate and attributed revenue

  • Measurement

    How we work
    Randomised holdouts within segments
    Typical retention management
    Platform attribution

  • Flow count

    How we work
    Fewer, properly segmented and tested
    Typical retention management
    Many, built once

  • Deliverability

    How we work
    Actively managed with sunset policies
    Typical retention management
    Assumed until it breaks

  • SMS strategy

    How we work
    Separate strategy for time-sensitive value
    Typical retention management
    Email calendar duplicated

  • Subscription churn

    How we work
    Cadence and experience first
    Typical retention management
    Discount save offers

  • Content

    How we work
    Written in your brand voice
    Typical retention management
    Templated across clients
Questions

Retention marketing, answered

What does an ecommerce retention agency do?
A retention agency owns the revenue that comes from customers you already have: email, SMS, loyalty, subscriptions, and the lifecycle programme that connects them. In practice that means automated flows triggered by customer behaviour, a campaign calendar, segmentation, and the deliverability work that determines whether any of it reaches an inbox. The distinguishing feature of good retention work is that it is measured on incremental revenue and repeat purchase rate rather than on open rates, which are close to meaningless as a decision metric since Apple's Mail Privacy Protection began pre-loading images.
How much of our revenue should come from email and SMS?
Commonly cited figures put it between 20% and 30% for established DTC brands, but the number is less informative than it looks and depends heavily on category, purchase frequency, and how long you have been building the list. A consumable product with a 30-day replenishment cycle should expect a far higher share than a furniture brand where customers buy once every several years. A more useful question than the percentage is whether your repeat purchase rate is improving, and whether the retention revenue is genuinely incremental rather than sales that would have happened anyway.
Which flows matter most?
For almost every store: welcome, abandoned checkout, abandoned cart, browse abandonment, post-purchase, and winback. Abandoned checkout is usually the highest revenue per recipient because intent is highest, and welcome is usually the highest total because it reaches everyone. Beyond those six, value depends on your model: replenishment flows for consumables, review request flows where social proof drives conversion, back-in-stock for constrained inventory. Brands frequently build twenty flows and would be better served by six that are properly segmented and actually tested.
Is SMS worth it?
Where the economics work, yes, and it is easy to get wrong. SMS has much higher open and click rates than email and much higher cost per message, plus a far lower tolerance for irrelevance: people unsubscribe from SMS quickly and do not come back. It works best for time-sensitive, high-value messages: abandoned checkout, restocks, launches, and shipping updates. It works badly as a second email channel sending the same campaign calendar. Compliance also matters more than in email, with real legal exposure under TCPA in the US and equivalent regimes elsewhere.
What about deliverability?
It is the constraint most brands discover only after it breaks. Sending to unengaged subscribers to inflate reach damages sender reputation, and once inbox placement degrades your best customers stop seeing you alongside everyone else. The practical work is sunset policies for unengaged contacts, proper authentication with SPF, DKIM and DMARC, segmentation by engagement rather than blasting the full list, and monitoring placement rather than assuming delivery equals inbox. Google and Yahoo's bulk sender requirements have made this materially less optional than it was.
Why are open rates no longer reliable?
Apple's Mail Privacy Protection pre-loads tracking pixels for Apple Mail users regardless of whether the message was opened, which inflates open rates and makes open-based segmentation and automation unreliable. Since Apple Mail represents a large share of consumer email, this affects most ecommerce lists substantially. Click-through, conversion, and revenue per recipient remain trustworthy. Any agency still reporting open rate as a headline metric, or triggering automation off opens, is working with a broken instrument.
How do you measure whether retention marketing is actually working?
By repeat purchase rate, time between orders, and revenue per recipient, with holdout groups where list size permits. Attributed revenue in a retention platform is systematically generous: it credits the email for purchases from customers who were already going to buy, particularly in flows like abandoned cart where intent was already high. Holdout testing, where a random slice of a segment receives nothing, is the only reliable way to separate incremental revenue from recorded revenue. We run them because the difference is frequently large.
Klaviyo, or something else?
Klaviyo is the default for Shopify for good reasons: deep native integration, strong segmentation, and combined email and SMS. It is not the cheapest, and at large list sizes the cost becomes material enough to warrant comparison. Alternatives worth considering depending on circumstances include Omnisend, Attentive for SMS-led programmes, and Braze for genuinely enterprise multi-channel requirements. That said, platform choice is rarely the constraint on results. We have seen far more programmes limited by segmentation and content than by tooling.
Can you help with subscriptions?
Yes. Subscription work splits into acquisition (how the offer is presented on the PDP and in checkout) and retention, which is where most of the value actually sits. Churn in the first three cycles is the number that determines subscription economics, and it is usually driven by cadence mismatch, unexpected charges, or an inflexible management experience rather than by the product. Pause and skip options, clear pre-billing notification, and flexible cadence typically outperform discount-based save offers, which train customers to churn deliberately.
How long before retention work shows results?
Flow improvements can show up within weeks, because they are triggered continuously and you are improving something already running. List growth and segmentation compound over months. Repeat purchase rate, which is the metric that actually matters, moves on the timescale of your purchase cycle: if customers buy every four months, you need at least two cycles before the trend means anything. Brands with long purchase cycles should expect to wait, and should be sceptical of anyone promising otherwise.
We already have flows set up. What would you change?
Usually not the number of them. The recurring problems we find are flows sending the same content to everyone regardless of purchase history or engagement, no testing beyond subject lines, unengaged subscribers still receiving mail and damaging deliverability, SMS duplicating the email calendar, and reporting on attributed revenue with no holdout. A programme with six well-segmented, tested flows and clean deliverability reliably outperforms one with twenty that were built once and never revisited.
How do you work with our brand and content team?
Retention content has to sound like the brand or it erodes the relationship it is meant to build. We work from your brand guidelines and existing assets, and where there is an internal content team we usually own the strategy, segmentation, and testing while they own voice and creative. The arrangement that fails is an agency producing generic templated campaigns that read like they were written for any brand, because subscribers notice quickly and the unsubscribe rate tells you.
Pairs well with retention

Where email and SMS retention gets help

Retention works best alongside the acquisition and conversion work feeding it.

Book a call

Tell us what your repeat purchase rate looks like

A 30-minute call, a look at your current flows and deliverability, and an honest read on where the incremental revenue actually is.

What happens next

  1. 1Pick a time for a 30-minute call.
  2. 2Tell us what your repeat purchase rate looks like, and have your current flows and deliverability to hand.
  3. 3Get an honest read on where the incremental revenue is.

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