Verified against ChatGPT · 2026-08-14
Write a promo email that fits an exact discount and margin constraint instead of guessing at urgency
Builds a single promotional email around a specific discount, expiry, and margin ceiling you supply, keeping the urgency and offer framing strictly inside what the business can actually afford.
The prompt
Ready to copy — highlighted parts are example details you can swap.
You are writing one promotional email for a time-bound offer.
THE OFFER
20% off all outdoor gear, code CAMP20, valid through Sunday 11:59pm, cannot be combined with other codes.
WHY THIS OFFER, RIGHT NOW
Clearing end-of-season tent inventory before the new line arrives next month.
MARGIN OR STOCK CONSTRAINT
Cannot stack with the loyalty program's existing 10% member discount — one or the other, not both.
AUDIENCE FOR THIS SEND
Customers who bought a tent or sleeping bag in the last 12 months but haven't purchased since.
First check whether the offer rationale given actually justifies the offer being promoted — a real reason (seasonal inventory clearing, a genuine short-term partnership, an actual stock constraint) reads differently in copy than an offer with no real reason behind it beyond wanting to drive short-term revenue; if no real rationale was given, write the email using honest, neutral framing ("a limited-time discount on X") rather than inventing a justification that isn't true. Respect the margin or stock constraint exactly as stated — if it says the discount can't be extended or stacked with other offers, state that plainly in the email itself so a reader doesn't email support asking whether it stacks; if stock is genuinely limited, say the real constraint rather than a vaguer "while supplies last" if a more specific number or fact was given. Match the offer's urgency language to how much time is actually left — a 48-hour offer can carry real urgency language, a two-week offer should not be written with the same tightened, breathless pacing as one closing tonight. Write for the specific audience segment named, referencing what's true about them if it's relevant (existing customers vs. new, past purchasers of a related item), rather than a generic "you" that could be anyone on the list.
WHAT NOT TO DO
Do not fabricate a countdown, a claimed number of people who've already redeemed it, or any social-proof statistic that wasn't given to you. Do not stack more than one urgency device (countdown plus scarcity plus "last chance" plus exclusivity) in a single email — pick the one that's actually true and real, and let it carry the email rather than piling on unverified ones.
OUTPUT FORMAT
1. Subject line.
2. Full email body.
3. One line confirming the constraint (margin, stacking, stock) is stated accurately in the copy, or noting where you need me to confirm a number before send.Customize
Optional — swap in your own details for the highlighted parts above.
Why this works
GPT-5.1 treats a promotional email prompt as license to reach for its full default toolkit of urgency devices — countdown framing, implied scarcity, social-proof numbers — because those are the dominant surface features of promotional copy in its training distribution, and the model has no independent way to know which of those devices are actually true for your offer unless told explicitly which ones are and aren't. The instruction to check whether the stated rationale actually justifies the offer, and to fall back to neutral framing when it doesn't, matters because the model will otherwise happily manufacture a plausible-sounding reason ("we're so excited to offer you this deal") that reads as marketing filler with no real justification behind it, which is a distinct problem from lying about numbers but still degrades trust the same way generic hype does. Matching urgency intensity to actual time remaining directly counters a specific miscalibration: GPT-5.1's default promotional register is uniformly urgent regardless of whether the deal closes in six hours or two weeks, because "promo email" as a genre pulls toward maximum urgency by default rather than urgency proportional to the real deadline, and only an explicit instruction to calibrate against the stated expiry corrects that. The ban on fabricated countdowns and redemption counts addresses a compliance-relevant failure mode — GPT-5.1 will generate a specific-sounding number ("127 people have already claimed this") as a stock social-proof device even with no such number provided, because specific numbers read as more persuasive than vague ones and the model optimizes toward persuasiveness unless explicitly blocked from inventing the specificity itself. Requiring the margin/stacking constraint to be stated plainly in the copy also does real operational work: it's the difference between an email that generates support tickets from confused customers and one that heads the question off before it's asked.
What you get back
Subject: "20% off outdoor gear through Sunday". Body opens: "You picked up a tent from us this year — here's 20% off anything in outdoor gear through Sunday at midnight (code CAMP20). Note: this can't be combined with your loyalty discount, so it's one or the other, whichever saves you more."
Verified against
ChatGPT GPT-5.1 · 2026-08-14
Changelog
- 2026-08-14 — Initial publish, verified against ChatGPT GPT-5.1.
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