Cross-sell to an existing customer
Day-14 post-purchase email recommending complementary products.
Hi {{firstName}},
By now you've had your {{productName}} two weeks. Two things customers commonly pair with it:
- **{{addOn1}}** — {{addOn1Note}}
- **{{addOn2}}** — {{addOn2Note}}
[Add to a new order]({{addOnURL}})
Free shipping over $50 still applies.
— The {{brand}} teamWhy this works
Cross-sell emails work when they recommend accessories or complements that build on the original purchase — not upgrades to bigger items.
**Day 14 is the sweet spot.** Earlier and the buyer hasn't formed an opinion on the original purchase; later and the moment has passed. Day 14 captures the buyer who's used the product, likes it, and is open to extending the relationship.
**Two items, not ten.** Two is the right number. Five feels like a catalog. Ten feels like spam.
**Specific 'pair with' framing.** 'Two things people pair with the {{productName}}' positions the recommendation as data-driven, not algorithmic spam. Real attach-rate data ('73% of customers also buy X') strengthens this further when you have it.
**Subject is service-y.** 'Two things people pair with' sounds like a recommendation, not a pitch. 'You might also like' is the algorithmic-spam default.
**Free shipping mention.** Restating the shipping threshold reduces friction on the add-on order. Many add-ons are sub-$50; mentioning the threshold subtly nudges toward bundle behavior.
Cross-sell conversion for this pattern on day-14: 4–9%, higher for brands with strong attach-rate data.