What 2,600 marketing emails taught us about discount codes

We archive marketing emails from real brands, the moment they land. That gives us a vantage point most shoppers never get: thousands of campaigns, side by side, with the discount codes pulled out automatically. Here is what the first few months of that archive actually show — and what it means if you are trying to save money.

Most “sale” emails don’t actually contain a code

The biggest surprise first: across 2,605 newsletters, only about 16.5% — roughly one in six — contained an actual coupon code. The rest were new-arrival announcements, “sale ends soon” nudges, brand stories and restocks. So if your inbox feels like an endless stream of discounts that never quite give you a code, you are not imagining it: most promotional email is about attention, not a redeemable offer.

That is exactly why a searchable archive helps — instead of digging through your inbox hoping a code exists, you can jump straight to the emails that actually carry one.

When there is a code, 20% off is the default

Of the campaigns that did include a code, the discounts clustered tightly. Ranked by how often they appeared:

Fixed-dollar offers showed up too (a recurring “$350 off” from mattress and home brands, for example), but percentage discounts dominated. The practical takeaway: if a brand is offering you less than 20% off, it is worth waiting — a 20–25% code is the norm, not the ceiling, and most brands cycle back to one within weeks.

Discount codes are seasonal — and predictable

The codes themselves give away the calendar. Spring campaigns leaned on codes like SPRING20; the US Memorial Day weekend produced a wave of MDW20; summer brought SUMMER-prefixed codes. Welcome flows reused the same shapes endlessly — a brand name plus a number (SKIMM20, TECHCRUNCH), or the word “email”/“VIP” plus a discount (15EMAIL, MYVIP20).

For shoppers that means the best discounts are scheduled, not random. Long weekends and season changes are when the strongest codes appear — and following a brand here means you see its next one without handing over your inbox.

How we got these numbers

Every figure above comes from CampaignCache’s own archive: 2,605 newsletters from 76 brands sent between March and June 2026, with coupon codes extracted automatically and the real merchant attributed (curator newsletters like Morning Brew or theSkimm often advertise other companies’ codes, so we attribute the offer to the actual store, not the sender). It is a point-in-time snapshot of a growing dataset, and automatic extraction is not perfect — we publish it as a directional picture, not a precise census, and we re-verify codes as the archive grows.

Want to see the live version of this data? Browse current deals or explore brands to see exactly which codes are circulating right now.