Why Flows Outperform Campaigns in E-Commerce Email Revenue

Email marketing in e-commerce has two modes: campaigns (manually-sent broadcasts to a segment) and flows (automated sequences triggered by user behaviour). Most brands spend 80% of their effort on campaigns and 20% on flows — and leave most of their email revenue on the table.

In a mature Klaviyo programme, flows typically generate 30–50% of total email revenue on 10–20% of email volume. They're sent to smaller, higher-intent audiences at exactly the right moment — which is why their revenue-per-recipient is 5–10× higher than broadcast campaigns.

Benchmarks across our client base: Welcome series typically generates £8–£22 revenue per recipient. Abandoned cart generates £12–£35 per recipient. Post-purchase upsell generates £5–£15 per recipient. These figures compound — a brand with 50,000 active subscribers and all 7 core flows live generates £40,000–£120,000 monthly from flows alone.

Flow 1: Welcome Series (The Most Impactful)

The welcome series is triggered when a new subscriber joins your list — before they've purchased. This is the moment of highest brand curiosity; send the wrong content (generic promotional blast) and you permanently set a low-engagement expectation. Send the right content and you build a relationship that converts.

The 4-email welcome series:

  1. Email 1 (immediate): Deliver your signup promise (discount code / free guide / lead magnet). Warm brand intro. Personal tone from the founder or a team member. No hard sell.
  2. Email 2 (Day 2): Your brand story — why you exist, what makes you different. Product education. Social proof (press mentions, review count, sustainability credentials).
  3. Email 3 (Day 4): Best-selling products or services. Customer testimonials with product-specific results. First purchase incentive (if not yet purchased).
  4. Email 4 (Day 7): For non-purchasers: stronger offer or urgency. For purchasers: thank-you and shift to post-purchase flow. Use conditional splits to suppress purchasers from promotional emails.

Flow 2: Abandoned Cart (Highest Direct Revenue)

Cart abandonment rates average 70–75% across e-commerce. Reaching these users within hours of abandonment — while the purchase intent is still high — is the single highest-ROI automation in e-commerce email.

The 3-email abandoned cart sequence:

  • Email 1 — 1 hour after abandonment: Simple, product-focused reminder. Show the abandoned product with image. No discount yet — many users will convert without one. Subject: "You left something behind."
  • Email 2 — 24 hours after: Introduce objection handling. Social proof (star rating, review count for the specific product). FAQ addressing common hesitations (returns policy, sizing, shipping). Optional: introduce 10% discount.
  • Email 3 — 48 hours after: Urgency (limited stock if accurate). Discount confirmation if introduced in email 2. Clear single CTA.
Don't send to purchasers: Always add a flow filter "Has placed order since starting this flow = false." Without this, customers who bought in another tab will receive cart abandonment emails — a jarring and trust-damaging experience.

Flows 3–5: Post-Purchase, Browse Abandonment, VIP

Flow 3 — Post-purchase sequence: Triggered at confirmed order. Email 1 (Day 1): order confirmation + brand story reinforcement. Email 2 (Day 3): shipping update + how to use / style guide for the product. Email 3 (Day 10): review request. Email 4 (Day 21): cross-sell / upsell based on purchased product category.

Flow 4 — Browse abandonment: Triggered when a subscriber views a product page but doesn't add to cart. Lower intent than cart abandonment but significant volume. Single email, 4 hours after browse, showing the viewed product. Expect 15–25% of cart abandonment revenue per recipient.

Flow 5 — VIP / High-Value Customer: Triggered when a customer crosses a LTV threshold (e.g., 3+ orders or £500+ spend). Welcomes them to "VIP status" with exclusive early access, personalised recommendation, or a thank-you gift. High deliverability — VIP customers have high engagement which maintains sender reputation.

Flows 6–7: Win-Back and Sunset

Flow 6 — Win-back: Triggered at 90 days since last purchase (or 60 days since last email open for non-purchasers). 3-email sequence: Email 1 (90 days): "We miss you" + best-sellers. Email 2 (97 days): Limited offer + urgency. Email 3 (104 days): Last chance + clear opt-out option.

Flow 7 — Sunset (list hygiene automation): Triggered after 180+ days of zero opens and zero clicks. 2-email sequence asking subscribers to confirm they still want to hear from you. Anyone who doesn't engage in 7 days is suppressed from future sends. This is not losing subscribers — it's removing unengaged contacts who are damaging your deliverability scores and inflating your Klaviyo bill.

Deliverability impact of sunset flows: Removing unengaged contacts from active send lists typically improves open rates by 5–15 percentage points — because you're now denominating against an engaged audience. This directly improves sender reputation and inbox placement rates.

Flow Optimisation: A/B Testing and Iteration

Flows need ongoing optimisation — the first version of any flow is never the best-performing version. Build in systematic A/B testing from the start:

  • Subject line tests: Test one variable per test (curiosity vs direct, short vs long, with/without emoji). Run for minimum 1,000 recipients per variant before concluding.
  • Send timing: Email 2 at 24 hours vs 36 hours. Timing interacts with purchase cycle — test rather than assume.
  • Offer threshold: 10% discount vs free shipping vs no offer. Many brands add discounts prematurely and train customers to abandon carts waiting for the offer email.
  • Email length: Long-form brand story vs short product-focused email. Category and audience segment determine which converts — test specifically for your brand.