A skincare brand we work with had a 90-day LTV of $62. The average customer bought once and never came back. At a $38 blended CAC, they were profitable on paper — but each customer was leaving $80 in potential revenue on the table. We built a 5-email post-purchase sequence in 2 days and set it live in Klaviyo in a third. 90-day LTV moved to $104. Same acquisition cost. 68% more revenue per customer acquired.
Why most post-purchase sequences fail
The most common post-purchase email flow we inherit: a transactional confirmation, a shipping notification, and a review request 7 days after delivery. Sometimes a discount code for the next purchase at day 10. That's it.
These flows fail at driving repeat purchase for two reasons. First, they're logistical, not relational — they tell the buyer what's happening with their order, then immediately ask for something (a review, another purchase) before demonstrating any continued value. Second, the timing ignores the product experience arc. For a skincare product, the buyer won't know if it works until week 2 or 3. A repeat purchase email at day 10 — before they've seen results — asks them to re-buy something they're still evaluating.
When we audit post-purchase flows, the most common finding is a technically functional sequence built around what's convenient to send, not what the buyer's timeline actually looks like.
The timing and angle for each of the 5 emails
Email 1 — Day 1 (delivery confirmation): Set the expectation Subject line angle: "Your order is on the way — here's what to expect in week 1." Purpose: not just a tracking link. Give the buyer the usage protocol for week 1 and tell them what results are realistic in the first 7 days. This calibrates expectations before they form incorrect ones, reduces early refund requests, and sets up the week-2 touchpoint naturally.
Email 2 — Day 8: The check-in Subject line angle: "One week in — seeing anything yet?" Purpose: acknowledge that results at 7 days are subtle and expected. Reassure buyers who haven't seen dramatic change that this is normal. Include one specific thing to look for in week 2. This keeps the buyer engaged with the product rather than quietly deciding to return it.
Email 3 — Day 16: The results window Subject line angle: "Week 2 is when most people notice the difference." Purpose: by day 16, buyers using the product correctly should be seeing early results. This email asks them to notice and articulates what to look for. It's also where we introduce the second product — framed as "for buyers seeing X result by week 2, Y product extends that further." Not a pitch. A natural next step presented as advice.
Email 4 — Day 22: The social proof nudge Subject line angle: "Others who started where you did — where they are at 3 weeks." Purpose: before/after results from customers at the 3-week mark. Real numbers, no invented dialogue. This email supports buyers who haven't seen clear results and gives them reason to continue, while reinforcing the decision for buyers who are already happy.
Email 5 — Day 28: The repurchase prompt Subject line angle: "You've got about 2 weeks of product left." Purpose: a 28-day supply runs low at day 28. This email arrives at the moment the buyer is physically running out. No discount needed here — urgency is logistical, not incentive-driven. For buyers who hesitate: a 10% discount valid for 5 days acknowledges the hesitation without devaluing the product for everyone else.
What happened with the skincare brand
Pre-sequence repeat purchase rate at 90 days: 12%. Post-sequence: 31%. The increase in LTV ($62 → $104) came almost entirely from that shift — not from higher AOV or discounting.
Email 3 (day 16) drove 34% of all second purchases. The timing worked because buyers were evaluating whether to continue using the product and received the second product recommendation exactly when they were asking "what's next?" Email 5 drove 51% of second purchases from buyers who needed the logistical prompt.
Set up email 1 in Klaviyo today
Create a new Flow triggered by "Fulfilled Order." Set the first email to send 24 hours after the trigger. Subject line: "[First name], your order is on the way — here's what to expect."
Body: 3 short paragraphs. Paragraph 1: confirm the order and delivery window. Paragraph 2: the week-1 usage protocol, specific not generic. Paragraph 3: one thing to notice by day 7.
No CTA to buy anything. No review request. Build the remaining 4 emails once you see the day-1 open rate — it'll tell you whether there's a deliverability problem before you invest time in the full sequence. Once the post-purchase sequence is live, the next automation to build is browse abandon and win-back — all four flows are covered in the email retention automation guide.