Sending the same email to your whole list is the fastest way to lower engagement and raise unsubscribes. Segmentation fixes that by matching the message to the person. The goal is not more segments. It is segments that change what you send, when you send it, and whether you send it at all.
The short version: start with engagement, lifecycle stage, and value. Add product affinity and discount sensitivity once those work. Judge each segment by one test: does it change the message or the decision to send?
Why segmentation matters now
Inbox providers increasingly rank mail by relevance, and engagement drives both placement and revenue. Segmenting by engagement protects sender reputation, and segmenting by behavior and value improves conversion. See AI and the Inbox and Email Deliverability for Ecommerce.
The core segmentation framework
| Dimension | Question it answers | Example segments |
|---|---|---|
| Engagement | Who is paying attention? | Clicked in last 30, 60, 90 days; unengaged 120+ days |
| Lifecycle stage | Where is the customer in the relationship? | Prospect, new customer, repeat customer, VIP, lapsed |
| Value | How much are they worth? | Top 10 percent by spend, high AOV, single-order buyers |
| Product affinity | What do they care about? | Viewed or bought a category or collection |
| Discount sensitivity | How do they buy? | Full-price buyers, promotion-only buyers |
| Source | How did they join? | Quiz, pop-up, giveaway, checkout, social |
| Channel preference | Where do they respond? | SMS subscribers, email-only |
Strategy 1: Engagement segments
The most important segmentation for deliverability and relevance.
- Highly engaged: clicked or purchased recently. Send the full program
- Moderately engaged: engaged within 90 days. Send most promotions and flows
- At risk: no engagement in 90 to 120 days. Reduce frequency, send stronger offers
- Unengaged: no engagement in a longer window. Run a re-engagement and then sunset
Define engagement by clicks and purchases, not opens, since opens are unreliable.
Strategy 2: Lifecycle segments
- New subscribers who have not bought: welcome and first-purchase content
- First-time customers: onboarding, education, second-purchase nudges
- Repeat customers: loyalty, cross-sell, replenishment
- VIPs: early access, appreciation, exclusive offers
- Lapsed customers: winback paths. See Win-Back Campaigns That Work
Strategy 3: RFM segmentation
RFM scores customers on recency, frequency, and monetary value.
| Segment | Profile | Approach |
|---|---|---|
| Champions | Recent, frequent, high spend | Reward, early access, referral asks |
| Loyal | Frequent, solid spend | Loyalty perks, cross-sell |
| Promising | Recent, low frequency | Nurture toward second and third order |
| At risk | Previously good, now quiet | Personal winback, relevant reason to return |
| Hibernating | Long gap, low value | Light-touch winback, then sunset |
Build and validate RFM segments well ahead of peak periods. See BFCM Planning Guide.
Strategy 4: Product and category affinity
- Customers who bought a category get content and recommendations for related products
- Browsers of a collection who have not purchased get targeted reminders
- Use post-purchase segments to cross-sell complementary items, not the same product again (unless it is consumable)
Strategy 5: Discount sensitivity
Segment full-price buyers from promotion-driven buyers.
- Protect margin by withholding blanket discounts from full-price buyers
- Use value-led messaging for people who buy without offers
- Use promotions for those who respond to them, and watch the effect on repeat behavior
Strategy 6: Source-based segments
- Quiz sign-ups receive content tied to their answers
- Giveaway sign-ups get a path that tests purchase intent before full program sends
- Social-sourced subscribers get a welcome that references where they came from
Strategy 7: Channel-aware segments
Segment by whether a person is on email only, SMS, or both, so you can coordinate sends and suppression. See SMS vs Email.
Building segments in Klaviyo
- Use properties and events together, such as placed order count, last order date, and clicked email
- Name segments clearly, with a naming convention the whole team uses
- Document the logic and the purpose of every segment
- Use predictive analytics fields where available, then validate them against real behavior
- Archive unused segments to keep the account clean
Putting it into practice: a campaign example
| Segment | Message |
|---|---|
| VIPs | Early access to a new collection |
| Engaged repeat buyers | Launch announcement with cross-sell |
| Engaged non-buyers | Launch with social proof and a first-order incentive |
| At risk | Short email with a clear offer |
| Unengaged | Excluded from the launch, or a single last-chance email |
How many segments do you need?
Start with five to ten that you use constantly. Add more only when you can name the message each one will receive. A long list of rarely used segments makes reporting harder and adds errors.
Measuring segmentation
- Revenue per recipient by segment
- Unsubscribe and complaint rates by segment
- Share of sends reaching each segment
- Incremental lift versus sending to everyone, using holdouts
Common segmentation mistakes
- Too many segments with no clear purpose
- Defining engagement by opens
- Using stale data or untested logic
- Sending the same message to different segments with only a subject line change
- Overlapping segments that cause double-sends
- Forgetting suppression, such as recent purchasers
Segmentation checklist
- ☐ Engagement tiers defined by clicks and purchases
- ☐ Lifecycle segments live
- ☐ VIP segment defined and used
- ☐ RFM segments built and validated
- ☐ Discount sensitivity segments in place
- ☐ Segment naming convention documented
- ☐ Suppression rules for recent purchasers and support issues
- ☐ Quarterly segment audit
FAQ
How many segments should I have?
Enough to change your messaging, and no more. Five to ten core segments is a practical starting point.
What is RFM?
A scoring approach based on how recently, how often, and how much a customer buys.
Should I send promotions to unengaged subscribers?
Rarely. Use a limited, targeted approach, then sunset those who do not respond.
Do segments help deliverability?
Yes. Sending to engaged audiences more often protects sender reputation.
How ATTN helps
ATTN builds segmentation frameworks for ecommerce brands on Klaviyo, tied to flows, campaigns, and cross-channel strategy. Talk to our retention team about a segmentation audit.