Email converts better than almost any other channel for a small business, because the people receiving it already gave you their address. It is also the only audience you own outright: platforms can restrict your account or change what they show, and a list cannot be taken away from you.
Build it properly from the start, because the rules matter here.
Collect addresses lawfully
Ask people who already deal with you: at the point of sale, when quoting, on delivery, and on your site with a clear reason to subscribe. Say what you will send and how often.
Buying a list is the practice most likely to create a problem. Direct marketing to people who did not consent is governed by the Protection of Personal Information Act, overseen by the Information Regulator, and every message must carry a working way to opt out.
Send something worth opening
Practical information, genuine offers, and things that help the reader rather than announcements about your business. The test is whether someone who is not currently buying still finds it useful.
Consistency matters more than frequency. A monthly email that always arrives builds a habit; sporadic sending trains people to ignore you and raises the chance of being marked as spam.
Segment by what you know
Customers who bought, people who enquired and did not, and different product interests should not receive identical messages. Even a rough split materially improves response.
The most valuable segment is existing customers. Most small businesses have never told their own customers everything they do, and that is the cheapest revenue available.
Measure the right things and keep the list clean
Track replies, enquiries and sales rather than opens, which are unreliable. A small list that buys is worth more than a large one that does not.
Remove people who never engage. A clean list improves deliverability and reduces cost, and honouring unsubscribes immediately is a legal requirement rather than a courtesy.
Frequently asked questions
Why does email work so well?
Because the recipient already gave you their address, and the list is an audience you own rather than rent from a platform.
Can I buy an email list?
No. Marketing to people who did not consent is governed by data protection law and every message needs a working opt-out.
What should I send?
Practical information and genuine offers that are useful even to someone not currently buying.
How often should I send?
Consistently rather than frequently. A predictable monthly email beats sporadic sending, which trains people to ignore you.
What should I measure?
Replies, enquiries and sales. Open rates are unreliable, and a small list that buys beats a large one that does not.
Originally published in June 2018. Updated September 2026 into practical guidance on building and using an email list.
