Email marketing: the only channel whose audience you own

Email marketing is the only channel whose audience you own. A social algorithm can change overnight and ad prices can rise, but an email list stays yours. That is why it is usually the most productive marketing channel relative to its cost.

In this guide I go through how to start email marketing in a small business: collecting the list lawfully, the automations worth building first, writing the messages and measuring the results.

Why email still works

Email marketing’s return relative to cost has stayed the best of any channel for years. There are three reasons. The audience asked for the messages themselves, so the interest exists. The channel is cheap: sending to a list of a thousand subscribers costs a few euros. And the message arrives without anybody in between deciding who sees it.

Email is especially effective with existing customers. Acquiring a new customer costs many times what it takes to get a current one to buy again.

Collecting the list lawfully

Email marketing to consumers requires consent. The practical rules:

• Consent has to be asked for clearly. A pre-ticked box does not count, and consent must not be buried inside another condition.
• Say what you send and how often. “Tips once a month” is better than “newsletter”.
• Unsubscribing has to be easy. A link in every message, and the unsubscribe has to work immediately.
• For business customers marketing is more permissible within your own industry, but the same good practices are worth keeping.
• Do not buy lists. They are unlawful, they generate spam complaints and they ruin your sending reputation permanently.

Methods that work for collecting subscribers: a useful downloadable guide, a discount on a first order in an online store, webinar registration, or simply asking at the start of a customer relationship.

Four automations worth building first

Automations produce more than one-off newsletters, because they land at the right moment. Start with these:

1. The welcome message

Sent immediately after subscription, when interest is at its highest. The open rate is typically clearly better than other messages. Say what the subscriber gets, give something useful straight away and briefly introduce what you do.

2. The abandoned cart reminder

The most profitable single automation for an online store. A reminder a few hours later and, if needed, a second one after a day recovers a significant share of interrupted purchases.

3. The post-purchase sequence

Thank you, instructions for use, a review request and in due course a complementary product. This sequence increases customer lifetime value and produces reviews that also help search visibility.

4. The wake-up message for inactive subscribers

For subscribers who have not opened anything for months. Ask whether they still want the messages. Some become active again, and the rest can be removed from the list, which improves your sending reputation.

How to write a message that gets opened and read

The subject line decides the open. Concrete and short beats clever. “Three mistakes in a roof repair” works better than “Spring news”. Avoid exaggeration and exclamation marks; they send the message to the spam folder.

One thing per message. A newsletter with eight topics does not get the reader to do anything. One subject, one call to action.

Write from a person to a person. Use a person’s name as the sender instead of, or alongside, the company name. A tone as if writing to a colleague, not as if issuing a press release.

Give value before you ask. A sensible ratio is around four useful messages to every one that sells. A list that only gets offers withers fast.

Optimise for mobile. The bulk of emails are read on a phone: short paragraphs, a large button, no wide tables.

What to measure

Metric	What it tells you	Indicative level
Open rate	Whether the subject line and sender work	20–40 %
Click rate	Whether the content interests	2–5 %
Conversion	Whether the message produces sales	decides everything
Unsubscribes	Whether the pace or content is wrong	under 0.5 % per send

Open rate is now an unreliable metric because of email clients’ privacy features, so weight clicks and conversions. Add tracking parameters to your links so you can see in analytics what email traffic produces.

Choosing a tool

For a small business one of the standard tools is usually enough: Mailchimp, MailerLite, Brevo, or Klaviyo for an online store. All have a free or cheap starting tier for a few hundred subscribers. More important than the tool is that you send regularly and that the automations are in place.

Segmentation makes messages relevant

The same message to everybody is the easiest but least effective approach. Once a list is segmented even roughly, results improve clearly.

The simplest and most useful splits are: bought versus not yet bought, active versus inactive, and area of interest if you know it. In ecommerce, purchase history too: somebody who bought dog food does not need cat offers.

Segmentation does not require a complex system. Two or three groups is enough to start and delivers most of the benefit. Building ten segments before you have sent anything at all is a classic way to get stuck.

When to send

General recommendations about send times are guesses, because audiences differ. For a B2B list a weekday morning often works well; for consumers evenings and weekends can work better.

The right way to find out: try three different times over a few weeks and see when the most clicks arrive. Most tools also have a feature that sends the message to each recipient at their own most active time.

Avoiding the spam folder

However good the message is, it produces nothing if it does not arrive. Four things matter most.

Technical authentication. SPF, DKIM and DMARC have to be configured for the sending domain. Without them messages increasingly end up in spam. This is a one-off setting your hosting support or a developer can handle.

List quality. Remove bouncing addresses and long-inactive subscribers. A poor list ruins the sending reputation for all your messages.

Content. Avoid image-only emails with no text, excessive exclamation marks and the classic spam words in the subject line.

Regularity. A message sent once a year to a forgotten list generates spam complaints. A regular pace keeps the reputation in good order.

Summary: the first month’s steps

Start by choosing a tool and moving your current contacts into it, provided you can confirm consent exists. Then build the welcome message, because it is the one automation that produces from day one.

Add subscriber capture to the site: one clear place where you say what the subscriber gets and how often. Send the first real newsletter within two weeks; do not wait for the perfect moment.

At the end of the month look at the click rate and whether the newsletter produced enquiries or sales. Those two numbers already tell you whether it is worth investing more and what kind of content your audience wants.

Frequently asked questions

Is email marketing worth it for a small business?

It is. The cost is small, the audience is yours and the return relative to the investment is typically the best of any marketing channel. It is especially productive with existing customers.

Is consent required for email marketing?

For consumers, yes: consent has to be asked for clearly and must not be hidden in other terms. Marketing to business customers is more permissible within your own industry, but the option to unsubscribe always has to be there.

How often should you send a newsletter?

Once a month is a safe starting point for most. What matters most is regularity and that every message has something of value for the reader. Sending too rarely makes the subscriber forget you; too often wears them out.

How do I get more email subscribers?

Offer something useful in return: a guide, a discount, a checklist or a webinar. Ask for the subscription at the start of a customer relationship and at the point of purchase too. Bought lists should never be used under any circumstances.

What is a good open rate?

The typical range is 20–40 per cent, but the metric is now unreliable because of email clients’ privacy features. Weight the click rate instead, and how many enquiries or sales the messages produce.