Newsletters: the marketing channel with the best ROI (that you're probably ignoring)

17 July 2026 · 5 min read · JetLevel

Quick and slightly uncomfortable question: if Instagram changes its algorithm again tomorrow, how many people still see what your business posts? And if the account is suspended by mistake? The answer, for most businesses, is: practically none.

Now the interesting part. There is a channel where no one can take your reach away, where the message lands directly in the inbox of someone who asked to receive it, and where, according to Litmus, every dollar invested returns on average around 36 dollars. It's called a newsletter. And you're probably ignoring it.

Email marketing and the ROI no one argues about

While the market debates social media trends, email remains, year after year, at the top of return rankings. For comparison, Google estimates around $2 in revenue for every dollar spent on Google Ads. Paid traffic is a great lever, but email math plays in a different league.

Why is the difference so big? Three reasons:

• Near-zero marginal cost. Sending to 500 or 5,000 contacts costs practically the same. No auction, no rising CPC.
• Warm audience. People on the list already know you and gave permission.
• Free repetition. You can talk to the same person every week without paying more for it.

The list is yours. The algorithm isn't.

The point that changes everything: social media followers are not yours. They belong to the platform, and organic reach has been falling for years — it's their business model: if you want to be seen, pay. The email list is the opposite: a company asset, exportable, independent of any platform. If a social network disappears (it has happened), the list remains. Social media management should feed the asset that is yours, not replace it.

It's the difference between renting and owning. Social networks are a rented store in a shopping centre that changes the rules whenever it wants. A newsletter is a store in your own name.

How to create a newsletter people actually open

Most newsletters are bad, so making a decent one already puts you ahead of almost all the competition. Four pillars separate the read from the ignored:

1. Value before selling. Give more than you ask: teach, inspire or entertain 80% of the time and sell in the other 20%. That's the logic of content marketing: selling without seeming to sell.
2. Consistency. A monthly send always on the same day is worth more than three random sends followed by silence. It builds reader habit and improves deliverability — spam filters penalise irregular senders.
3. Segmentation. The customer who bought yesterday shouldn't receive the same email as the year-old lead. Even two or three simple segments make a huge difference to open rates.
4. A subject line that gets opened. Short (mobile cuts it off), specific ("3 mistakes that inflate your construction budget" beats "July newsletter"), with honest curiosity and a human sender — never "no-reply@".

What is a newsletter actually for?

"Sending emails" is not a goal. These are the three use cases with real return:

1. Nurture leads. Most visitors don't buy on the first visit. A newsletter keeps the conversation alive until the moment to buy arrives.
2. Reactivate old customers. People who have already bought are the cheapest audience to convert again.
3. Launches. With a list, a launch starts with hundreds of attentive people on day one. Without a list, it starts from zero — or from an ad budget.

And there's a modern multiplier: marketing automation makes entire sequences (welcome, follow-ups, reactivation) run by themselves, and AI agents already help personalise content and send times at scale.

GDPR: consent is not optional (and that's good for you)

In the European Union, the rule is clear: you cannot send commercial emails to anyone who hasn't given consent. Buying lists isn't a shortcut, it's an infringement — and a terrible strategy. What you need to ensure:

• Explicit consent: unticked checkbox, with clear purpose;
• Consent record: when and how each person subscribed;
• Easy unsubscribe: visible removal link in every email;
• Transparency: who the sender is and how data is processed.

And the detail many ignore: GDPR makes your list better. People who asked to receive your emails have incomparably higher open and conversion rates. The law isn't the obstacle — it's the quality filter.

Where to start

The most common mistake is to postpone because of perfectionism. You don't need 5,000 subscribers or a designer. You need:

1. An email marketing tool: there are serious options with free plans up to a few hundred contacts;
2. A reason to subscribe: a guide, a discount, exclusive content;
3. A form on the website: your website should capture contacts every day, not just visits;
4. A realistic rhythm: fortnightly or monthly, but sacred.

In a year, the business that started today has its own warm, profitable list. The one that postponed has exactly the same as now: algorithm dependency.