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Framework to approach Retention

A practical model for how to think about retention — and why email marketing alone isn't enough.

Written by Frank Birzle

tl;dr

  • Retention is not email marketing — it encompasses the entire customer journey across four stages

  • The four stages: Acquire → Activate → Retain → Resurrect

  • Email open rates are misleading: only around 10–15% of your customers actually read and consume your retention communications

  • Activate (getting customers to buy a second time) is the hardest stage for ecommerce — because unlike SaaS, you can't see what happens between purchases

  • Brand amplifies everything: when your product becomes a commodity, brand is the reason customers come back to you and not a cheaper alternative


Why retention matters for growth

Companies that grow consistently all have one thing in common: they retain customers. When you look at year-on-year revenue growth rates alongside how well brands retain customers over time, the correlation is clear — brands that shrank had significantly weaker retention than brands that grew. You don't need perfect retention to grow, but you need a baseline. Without it, every new customer you acquire just replaces one you lost.


The email marketing misconception

Most brands, when asked if they do retention marketing, say yes — and then describe their email flows. Email is a great channel, but an email strategy is not a retention strategy.

Here's why it's not enough on its own. Take a 50% open rate — which is strong. A significant portion of those opens aren't real: customers opening just to archive or delete. Discount that by half. Of what's left, how many actually read the full email or every email in a flow? If you're lucky, half. So in practice, your retention communications are reaching maybe 10–15% of your customers.

That's not a foundation for a retention strategy. It's one signal in a much larger system.


The four stages of retention

1. Acquire

Retention starts before someone is even a customer. Acquiring the right people — those with the highest probability of becoming loyal, high-CLV customers — is the foundation of everything that follows. Acquiring the wrong customers at scale is a fast way to make retention look impossible.

2. Activate

Activation means ensuring that customers have the best possible experience with your product, so they buy again. This is arguably the hardest stage for ecommerce brands.

In SaaS, you can measure activation directly — logins, feature usage, engagement scores. For ecommerce, almost everything that happens between a customer receiving their order and deciding to buy again is invisible to you. You only find out at the end: did they buy again, or not? That gap makes activation genuinely difficult to optimise, and most brands underinvest in it as a result.

3. Retain

Once a customer has bought a second time, the work shifts to nurturing them into loyal, repeat customers — while actively preventing churn. This is the classic "retention marketing" phase: lifecycle emails, loyalty programmes, personalised communication. But it only works well if Acquisition and Activation have done their job first.

4. Resurrect

For customers who did churn — who stopped buying and haven't come back — the goal is to give them a new reason to return. This might be a new product launch, a reactivation offer, or simply reminding them why they bought from you in the first place. It's harder than retaining an active customer, but far cheaper than acquiring a new one.


Brand: the multiplier across all four stages

Brand is the most overlooked driver of retention — and financially, it's one of the most important.

Most products are already a commodity, or will become one. Competitors will copy your product. Prices will converge. When that happens, the question customers ask is: "Who do I buy from?" If they feel something for your brand — trust, affinity, identity — they'll choose you even at a slightly higher price. If they don't, they'll buy wherever is cheapest.

Brand doesn't replace the four stages above. It amplifies them. Customers are easier to activate when they trust your brand. Easier to retain when they feel loyalty to it. Easier to resurrect when the brand means something to them.


Where to go next

Retention is a multi-dimensional discipline. Most brands invest in only part of it — usually email, usually Retain — and leave the rest on the table. The videos and articles below go deeper into each area:

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