The list is the margin: email returns £41 per pound while auction prices rise every year

The verified numbers

The DMA's Email Tracker, published March 2026, puts email's return at £41 for every pound spent, up from around £38 the year before, on UK marketer data. Platform data points the same direction, with the usual caveat that platforms measure their own channel generously: Omnisend's 2026 report across 150,000 brands and 27 billion emails sent in 2025 calculates $79 returned per dollar across email, SMS and push combined.

The more useful numbers are the structural ones, because they tell you where the money actually sits. Klaviyo's benchmarks, published January 2026 across more than 183,000 accounts, found automated flows generate nearly 41 percent of total email revenue from just 5.3 percent of sends, with revenue per recipient nearly 18 times higher than campaigns. Omnisend's data agrees on the shape: automation was 2 percent of sends and 30 percent of email revenue in 2025, and abandoned cart and welcome flows alone drove 76 percent of all automation-generated orders. Two automated sequences, built once and improved quarterly, carry most of the channel.

One honest caveat before the arithmetic. Platform-attributed revenue overstates incrementality, because some attributed buyers would have purchased anyway. The DMA figure is survey-based and the vendor figures are self-measured. The channel does not need generous measurement to justify itself, but a brand that wants the true number runs holdout tests, and most have never run one.

Why the list beats the auction on margin

This is the same market described from the other side. Median Meta CPMs rose 13.2 percent in the year to July 2026 on Triple Whale's benchmark of 40,000+ brands, and every year the auction takes a larger share of the first order's contribution. The economics of most D2C brands now resolve to a single fact: the first order pays for the customer, and the second order pays the owner. Email and SMS are the channels that produce the second order at a marginal cost close to zero, from an asset that no platform can reprice, throttle or take away.

Yet the under-investment is almost universal, and the reasons are structural rather than stupid. Paid media produces a dashboard, a daily number and a feeling of control; the list compounds quietly and rewards patience. Ad spend is a supplier relationship with an account manager attached; the lifecycle programme is internal work nobody is accountable for. And because email is cheap to send, it gets treated as cheap to run, so the welcome flow is three years old, the cart flow is one message, and the calendar is a discount every time cash flow tightens.

The discount habit deserves its own sentence, because it is where the channel's margin quietly leaks. A list trained to wait for 20 percent off is a list whose revenue arrives with a fifth of the margin removed, and whose full-price buyers learn to stop paying full price. The alternative is not never discounting; it is having enough genuinely useful sends, restock notices, new-product access, usage content, that the discount stays an event rather than the price. The same discipline applies to the asset itself: lists decay, typically losing a meaningful share of engaged subscribers a year to address churn and fatigue, so a programme that is not actively capturing new consent is shrinking even when the subscriber count looks flat.

What a proper lifecycle programme contains

• Capture worth the trade. A sign-up offer tested as seriously as an ad, on every entry point, with SMS consent collected where the margin supports it.
• A welcome sequence that sells. Three to five messages carrying the positioning, the proof and the first-purchase reason. This is one of the two flows that drive three-quarters of automation orders; it deserves the same craft as the best landing page.
• Abandonment coverage. Cart, checkout and browse, sequenced, with the objection handled rather than just the reminder sent.
• Back-in-stock and price-drop triggers. Small volumes, outsized intent: back-in-stock messages converted at 6.46 percent in Omnisend's 2025 data, the highest of any automation type it measured. For brands with rolling stock, this flow is free money left unbuilt.
• Post-purchase and replenishment. The messages that create the second order: usage, review request, cross-sell timed to the product's actual consumption cycle. For consumables this flow is the business model.
• Winback and sunset. A defined lapsed point, a genuine attempt to recover, and the discipline to stop mailing the dead weight so deliverability protects everything else.
• A campaign calendar with a point. Campaigns still matter for reach and revenue spikes; they just should not be the whole programme, and they should not all carry a discount.
• Measurement that separates attributed from incremental. Revenue per recipient by flow, list growth against churn, and at least one holdout test a year. This is analytics and reporting work as much as CRM, email and retention work, and it is the part most brands skip.

What to do

Pull three numbers this week: the share of total revenue your platform attributes to email and SMS, the share of that coming from flows, and the date each flow was last changed. If flows are under a third of email revenue, or the welcome sequence predates your current range, the cheapest growth available to you is sitting in the channel you already own. That gap is one of the first things we size in the free Business Scan, because it is usually the fastest thing found there.