Acquiring a customer is good. Keeping them is where the profitability of an e-commerce brand truly lies. Yet, in 2025, 65% of e-commerce companies still invest the majority of their budget in acquisition, neglecting a much more profitable lever: retention.
The reality is simple. Retaining an existing customer costs between 5 and 25 times less than acquiring a new one. And a mere 5% increase in retention rate can generate up to 95% more profit. This is not a strategic detail. It's a shift in business model.
And CRM is at the heart of this change.
Retention and loyalty: not quite the same thing
Before going further, a useful distinction. Customer retention is the ability to keep customers after a first purchase. Loyalty goes further: it's building a lasting relationship that makes them want to return, recommend, and increase their average basket size over time.
CRM plays a role in both. But it is primarily the tool that allows a shift from a transactional logic to a relational one.
Why CRM is the central tool for retention
A well-configured CRM does more than just store contacts. It centralizes all customer data—purchase history, browsing behavior, interactions with your emails, communication preferences—and makes it actionable in real time.
In concrete terms, it changes everything. Rather than sending the same message to your entire list, you precisely identify who buys often, who is disengaging, who has just made their first purchase, and who deserves special attention. And you address each of these profiles differently, at the right time, with the right message.
According to a 2025 study, 75% of consumers say they would be more loyal to brands that understand their needs and personalize their experience. A CRM is precisely the tool that makes this personalization possible at scale, without spending hours on it manually.
The 6 retention levers that a CRM can activate
1. Behavioral segmentation
The first lever is to stop treating all your customers the same way. A CRM like Klaviyo allows you to create dynamic segments based on each customer's actual behavior: purchase frequency, average basket size, recency of last purchase, products viewed, level of engagement with your emails.
These segments then feed targeted communications. Your loyal customers receive VIP offers and early access to new products. Your new customers receive a welcome sequence that gradually onboards them. Your at-risk customers receive a reactivation reminder before it's too late.
This is the basis of any serious retention strategy.
2. Automated loyalty-oriented flows
CRM flows are the most powerful tools for continuous retention, without manual intervention. Some essential flows for retention:
The post-purchase flow is often the most underutilized. It serves to thank, reassure, request a review, offer cross-sells, and create an emotional connection immediately after purchase. This is the window where engagement is highest, and where a good experience can turn a one-time buyer into a regular customer.
The reactivation flow targets customers who have been inactive for 60, 90, or 120 days. The objective: to bring them back before they leave permanently. A good win-back flow combines a personalized reminder, a suitable offer, and a final farewell email if no response is recorded.
The birthday or loyalty flow rewards customers at key moments in their relationship with the brand. A birthday email with a gift or discount generates a strong emotional response and an excellent conversion rate.
3. Personalization at scale
72% of consumers say that loyalty programs influence their purchasing behavior, according to Deloitte (2025). But what truly builds loyalty is not generic points or discounts. It's the feeling of being recognized and understood.
A well-used CRM allows you to send product recommendations based on purchase history, adapt the tone and content according to the customer's profile, and anticipate needs even before the customer expresses them. This is the shift from mass marketing to relevance marketing.
4. Monitoring satisfaction and disengagement signals
Churn never happens suddenly. It builds up gradually: an unresolved delivery delay, an overly generic email, a lack of response from customer service, excessive sending frequency.
A CRM can detect these signals before they lead to permanent departures. A drop in open rates, no purchases for 60 days, a declining click-through rate: these indicators should trigger automatic actions, a gentle reminder, a request for feedback, or a re-engagement offer.
According to the Loyoly Industry Report 2025, 25% of customers leave simply because they feel overly solicited. The balance between presence and marketing pressure is managed directly in your CRM settings.
5. Customer support integrated with CRM data
Customer support that cannot see the purchase history of the customer they are assisting is at a disadvantage. The integration between your CRM and your customer service tools (Gorgias, Zendesk, or Klaviyo's Customer Hub) completely changes the quality of interactions.
The agent immediately sees what the customer ordered, when, how many times, and their recent interactions with the brand. They can respond in a personalized way, offer a suitable solution, and turn a friction point into a loyalty opportunity.
33% of customers lose their loyalty due to unresponsive customer support. This is a figure that should alert all brands.
6. RFM analysis to identify your priority customers
RFM (Recency, Frequency, Monetary) analysis is one of the most effective methods for prioritizing your retention efforts. It classifies your customers based on three criteria: when they last purchased, how often, and for what total amount.
This classification allows you to immediately identify your best customers to pamper, your at-risk customers to re-engage urgently, and your "one-time" customers to convert into regular buyers. On Klaviyo, this segmentation can be built and updated automatically.
Mistakes that drive customers away
It's good to know what not to do. The main causes of churn in e-commerce according to 2025 data: a perceived drop in quality (72% of respondents), emails that are too frequent or too generic (25%), slow or inaccessible customer support (33%), and unrewarded loyalty (30%).
These figures show that retention is not just about promotions. It's about the overall experience, consistency of communication, and the feeling of being truly recognized as a customer.
What The Modern Letter concretely does to improve your retention
At The Modern Letter, retention is at the heart of everything we build on Klaviyo. Post-purchase flows, RFM segmentation, win-back, personalization of campaigns according to the customer lifecycle: every element is designed to transform your one-time buyers into loyal customers who return, recommend, and increase their value over time.
Because a well-managed customer base is a recurring revenue channel that doesn't depend on advertising algorithms or rising CPMs.
