Contacting lapsed customers: consent rules for email vs. mail
Win-back aims at the exact customers whose permission trail has gone coldest: months of silence, maybe an unsubscribe somewhere along the way. That makes the channel rules more decisive here than anywhere else in marketing — they literally determine who is reachable at all. Plain English follows, not legal advice; jurisdictions differ and rules move.
Email: consent decides, and time weakens your case
- The marketing-consent flag is the gate. A past purchase creates a customer, not permission. Shopify records marketing consent per customer, and a win-back tool should check it at send time — consent given last year can be withdrawn tomorrow.
- Lapse makes the rules stricter in practice. Regulators and inbox providers alike are hardest on mail to long-inactive addresses: spam-trap risk rises, engagement signals fall, and the “recent relationship” arguments fade with every quiet month. The oldest slice of your lapse pool is the least email-reachable slice — structurally.
- Unsubscribes are forever, and channel-wide for email. The suppression list outranks every ladder and every good intention (the ladder respects it by design).
Postal mail: the consent-free channel, used with manners
US rules impose no opt-in for marketing mail to your own customers — the shipping address on their past orders is sufficient. For win-back this is not a loophole; it’s the load-bearing fact: the customers most worth winning back are disproportionately the ones email can no longer legally or practically reach, and a printed card reaches them cleanly. The obligations that remain are practical: a real return address on every piece, one card per lapse episode rather than a drumbeat, and an honored do-not-mail list, law or no law.
The ladder the rules design for you
Put the two regimes side by side and win-back’s structure falls out: email carries the free, frequent touches for the consented; paper makes the single, higher-cost, consent-free touch for the high-value customers beyond email’s reach (the LTV gate keeps it economical). Each channel does what its rules encourage — which is what compliance-by-design means in practice.
What to demand of tooling
None of this should live in your memory: consent checked per send, suppression lists that always win, unsubscribe plumbing on every email, mailability checks before any card, instant ladder-stop when the customer returns, and spend caps bounding the whole machine. Your job is deciding who’s worth winning back; the tool’s job is making the wrong send impossible.
Common questions
›Can I email a lapsed customer who never opted into marketing?
This is exactly where email rules bind hardest: months after their last order, the "existing relationship" argument is at its weakest and the marketing-consent flag is the honest gate. Well-behaved win-back email goes to customers with recorded consent, checked at send time — and unreachable-by-email is precisely the gap the postcard rung exists to fill.
›A customer unsubscribed a year ago. Can win-back still reach them?
Not by email — the unsubscribe is permanent until they opt back in themselves. By post, yes: US postal marketing needs no opt-in, and the unsubscribe covered email only. A single, well-made card to a valuable lapsed customer is lawful and usually lands well. "Stop contacting me," though, means every channel, forever.
›What must win-back emails always include?
One-step unsubscribe honored immediately, your physical address, truthful subject lines — plus one-click List-Unsubscribe headers if you send at volume. A good tool attaches all of it automatically and checks the suppression list at send time, not just at scheduling.