Email marketing for SMEs: a first-steps guide to start selling by email

Why email marketing still works in 2026

There is a recurring myth in digital marketing: 'email is dead.' People have been saying this for 15 years, and every year email marketing proves the opposite. The average ROI of email marketing is £42 for every £1 invested, according to data from the Data & Marketing Association. No other digital channel comes close.

The reason email works so well is structural: when someone gives you their email address, they are giving you permission to communicate with them directly. There is no social media algorithm deciding whether your message reaches them or not. There is no paying for each impression. The email lands in the subscriber's inbox — someone who has freely chosen to receive your communications.

For an SME, email marketing also has the advantage of not requiring large budgets or specialist teams to get started. With current tools, a single person can manage an effective email marketing strategy with a few hours per month.

How to build your subscriber list from scratch

The subscriber list is the most valuable asset in email marketing. A small but well-qualified list (people genuinely interested in what you offer) is infinitely more valuable than a large list of generic contacts.

Form on your website: The most basic method. Place a subscription form in strategic locations on your site: the header, footer, after blog articles and as an exit-intent popup. The form text must clearly communicate what subscribers will receive and how often.

Lead magnet: Offer something of real value in exchange for the email address: a guide, a checklist, a template or a free tool relevant to your sector. A good lead magnet can multiply subscription rates by three or four times compared to a simple form.

Existing clients: If you already have clients, ask for their explicit permission to subscribe them to your list. GDPR requires express consent, so do not import contacts without permission. But a personalised email to your best clients inviting them to subscribe to your newsletter has a very high conversion rate.

Physical form in your premises: If you have a physical location, a tablet with a subscription form at the counter (with an incentive like a discount on the next purchase) can generate high-quality local subscribers.

Email marketing tools for SMEs

You do not need an expensive tool to get started. Email marketing platforms have free plans sufficient for an SME in its early stages.

Mailchimp: The best known. Free plan up to 500 contacts and 1,000 emails per month. Easy to use, good template editor, basic automations included. Sufficient for getting started.

Brevo (formerly Sendinblue): Free plan with unlimited contacts and up to 300 emails per day. Very good value for money on paid plans. Includes SMS marketing and basic CRM.

MailerLite: Free plan up to 1,000 subscribers. Very clean and intuitive interface. Good automation options and landing pages included.

ActiveCampaign: The most powerful option for growing SMEs. No free plan, but its integrated CRM and advanced automations make it especially valuable if you want to connect email marketing with the sales process.

Types of emails your business should send

A solid email marketing strategy combines different types of emails with different objectives.

Regular newsletter: Regular value content (weekly, fortnightly or monthly). The objective is to maintain the relationship and position you as an authority. It does not sell directly, but builds trust that later converts.

Welcome emails: The most important sequence. Emails sent in the first 24–48 hours after subscription have the highest open rates. Use them to introduce yourself, set expectations and offer the lead magnet if you promised one.

Promotional emails: Offers, launches, discounts. They should be used in moderation — if everything is a promotion, the list will disengage. The general rule is 80% value content, 20% commercial content.

Re-engagement emails: For inactive subscribers or clients who have stopped buying. A personalised email with an incentive can reactivate a significant portion of these contacts.

How to write subject lines that get opened

The email subject line is what determines whether the subscriber opens or ignores your email. You can have the best content in the world, but if the subject line does not generate curiosity, the email will not be opened. The average open rate in email marketing is around 21%, but with good subject lines you can exceed 35–40%.

The elements that most influence opens are: personalisation (including the subscriber's name in the subject line improves opens), specificity (a concrete subject line works better than a vague one), curiosity (generating a question that can only be answered by opening the email) and genuine urgency (not manufactured).

Avoid words that trigger spam filters: 'FREE', 'EARN MONEY', 'EXCLUSIVE OFFER' in capitals, excess exclamation marks. Always test two versions of the subject line (A/B test) with a small portion of your list before sending to the full list.

Email marketing metrics: what to measure and what to optimise

The main metrics you should monitor for each campaign are: open rate, click-through rate (CTR), conversion rate, bounce rate and unsubscribe rate.

The open rate measures interest in the subject line and brand recognition. If it consistently falls, review the quality of your list and the relevance of your subject lines. The click-through rate measures interest in the email content. If opens are good but clicks are low, the problem lies in the body of the email or the CTA.

The conversion rate is the metric that matters most for the business: how many people who opened the email end up taking the desired action (buying, booking, downloading). Optimise this by making the CTA clear, singular and easy to execute.