What's a realistic ROI for email marketing?

Industry figures often quote returns in the region of £30–£40 for every £1 spent, though that's an average across high-performing senders. Your real return depends on list quality and relevance. Even a fraction of that headline figure beats most paid channels.

Do I need a big list for email to be worth it?

No. A small, engaged list of genuine prospects or customers outperforms a large bought list every time. A few hundred people who chose to hear from you can generate meaningful revenue; relevance matters far more than size.

Isn't email marketing just spam?

Done badly, yes. Done well, it's permission-based: people opt in, you send things they find useful, and they can leave easily. UK GDPR and PECR rules require consent and a clear unsubscribe — which, helpfully, also makes for better marketing.

Email Marketing ROI: Still the Best Channel?

Every year someone declares email dead, replaced by whatever channel is fashionable — social, then messaging apps, then short-form video. And every year, email quietly continues to generate more revenue per pound than almost anything else businesses spend on. In 2026 that's still true. The question is why, and whether it's true for your business.

Why the ROI is so high

The headline figures — often quoted at £30 to £40 returned for every £1 spent — sound too good to be real. They're averages skewed by excellent senders, so treat them as a ceiling rather than a promise. But the underlying reasons email performs are solid and worth understanding.

You own the audience. Unlike followers on a platform that can change its algorithm or ban your account overnight, your email list is yours. You can reach those people any time, for free, without an intermediary deciding who sees you.
It reaches people who already chose you. Everyone on your list opted in. They're warmer than any cold ad audience, so they convert at much higher rates.
The costs are tiny. Sending to 5,000 people costs roughly the same as sending to 500. The marginal cost of an extra email is close to nothing, which is why the ROI maths looks so favourable.

Key takeaway: Email wins because it's an owned audience of people who already chose you, reached at near-zero cost. No platform can switch it off or charge you per view — that's why its ROI stays so high.

The catch nobody mentions

Those eye-watering ROI figures come with a condition: you have to have a list, and it has to be good. Email's return is high because it monetises an audience you've already built — it doesn't build that audience for you. This is the genuine limitation.

If you're starting from zero, email isn't your customer-acquisition engine; it's your customer-retention and conversion engine. You still need other channels — SEO, ads, content, social — to bring strangers in. Email's job is to capture them, nurture them, and turn one-time buyers into repeat ones. Think of it as the channel that multiplies the value of every other channel rather than replacing them.

Where email earns its keep

Email is at its most powerful in a few specific jobs:

Turning browsers into buyers

Most people who visit your site aren't ready to buy today. Capturing an email address lets you stay in touch until they are. A simple welcome sequence often recovers sales that would otherwise vanish.

Recovering abandoned carts

For ecommerce, automated reminders to people who left items in their basket are among the highest-return emails you can send. If you run a store, this alone can justify the channel — well-built ecommerce developers can wire these flows into your shop so they run automatically.

Bringing customers back

Winning a new customer typically costs five times more than keeping an existing one. A monthly newsletter or a well-timed offer keeps you front of mind, driving repeat purchases at almost no cost.

How to start without becoming spam

Email done badly is irritating and, under UK GDPR and PECR, often unlawful. Done well, it's welcomed. The rules are simple:

Get genuine consent. People should actively opt in — a pre-ticked box or a sneaky add-on doesn't count. Bought lists are both illegal to email under PECR in most cases and useless anyway.
Send things people actually want. Useful, relevant, occasionally entertaining. If every email is a hard sell, people leave.
Make leaving easy. A clear unsubscribe link is legally required and, counterintuitively, builds trust.
Be consistent. A reliable monthly email beats sporadic bursts followed by silence. Rhythm keeps you familiar.

The tools are cheap and capable

You don't need an enterprise platform to start. Tools like Mailchimp, MailerLite or Brevo offer free or low-cost tiers that handle sign-up forms, automated sequences and reporting. For most small businesses, the limiting factor isn't the software — it's having something worth saying and the discipline to send it.

If you want email woven into a broader plan rather than running in isolation, a digital marketing agency can connect it to your acquisition channels so new visitors flow smoothly onto your list and into automated nurture sequences.

So, is it still the highest-ROI channel?

For businesses with an audience to email — yes, in 2026 it remains one of the most cost-effective channels available, and probably the best value of all when measured per pound spent. The honest caveat is that it rewards those who've already done the work of attracting and capturing an audience. Build the list first, treat it with respect, and email will quietly out-earn the flashier channels for years.

Ready to make email part of a proper strategy? Compare vetted UK specialists in our directory and shortlist those with strong reviews for email and retention work.

Email Marketing: Still the Highest ROI Channel?