Email marketing basics for small businesses

Email marketing is the practice of sending planned, useful messages to people who asked to hear from you. For a small business it is one of the few marketing channels you fully control. Nobody can change an algorithm and quietly cut you off from your own list, and the people on it already know who you are.

This guide covers what you need to get started and the habits that keep a list healthy over years rather than weeks.

Why email still matters

Social platforms decide who sees your posts. Search engines decide who finds your pages. Email is different: if someone is on your list and your messages reach the inbox, they see your name. That makes email the channel you build up as an asset over time.

Email also tends to work best for businesses where people buy more than once, or think about a purchase for a while before committing. A coffee roaster, a dentist reminding people about checkups, and a consultant whose clients take months to decide all benefit in different ways.

Three kinds of email you'll send

It helps to separate your email into three groups, because each one is set up differently.

Automated sequences. Emails that go out by themselves when someone does something: joins your list, buys for the first time, leaves a cart. You write them once and they work for years. See welcome sequences and abandoned cart emails.
Campaigns. One-off emails you send to all or part of your list: a newsletter, a launch, a seasonal offer.
Transactional emails. Order confirmations, password resets and receipts. These come from your website or store, not your marketing platform, and have different rules. Our guide to transactional vs marketing email explains the split.

What you need before your first send

Before your first send

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A dedicated email platform. Mailchimp, Klaviyo, Kit, Beehiiv and others handle sign-up forms, unsubscribe links, list management and reporting. Sending a newsletter by BCC from Gmail or Outlook breaks the law in most places (no unsubscribe link) and harms your normal inbox's reputation. See choosing an email platform.
A sending domain you own. Send from an address at your own domain, such as hello@yourbusiness.com. Your platform will ask you to add SPF and DKIM records to your domain's DNS, and you should also have a DMARC record. Gmail and Yahoo require this for anyone sending in volume. See staying out of spam.
A sign-up form with clear permission. People should know they're joining a mailing list and roughly what they'll get. A form on your website, a checkbox at checkout and a sign-up link in your email signature are good starting points. See building your list.
A welcome sequence. The first emails a new subscriber receives get the most attention they'll ever give you. Set this up before you start promoting your sign-up form.
A realistic rhythm. Pick a frequency you can actually keep. A good monthly email beats a weekly email that stops after six weeks.

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The legal basics

These are the rules most small businesses run into. They're not legal advice, and the details depend on where you and your subscribers are.

United States (CAN-SPAM). The FTC's guidance says commercial email must not use false or misleading header information or deceptive subject lines, must identify itself as an ad where appropriate, must include your valid physical postal address, and must give people a clear way to opt out. You have to honor opt-out requests within 10 business days. CAN-SPAM does not require prior consent, but sending to people who never asked damages your deliverability anyway.
EU and UK. Under GDPR and the related electronic marketing rules, you generally need clear, opt-in consent before sending marketing email to individuals, with a narrow exception for existing customers buying similar products. Pre-ticked boxes don't count as consent. See GDPR basics.
Canada (CASL). Canada's anti-spam law requires consent, express or in some cases implied, before you send commercial email, and it carries serious penalties.

A good email platform helps with all of this: it adds an unsubscribe link and your address to every campaign, and it records when and how each person signed up. Keep that record. If anyone ever questions whether they agreed to hear from you, it's your proof.

What to send

The emails people keep opening share one trait: they're useful or interesting to the reader, not just a reminder that you exist. Some formats that work for small businesses:

A short newsletter with one main idea, one piece of news and one call to action.
How-to content that answers a question customers often ask you.
Behind the scenesA new product being made, a project you finished, a team member's story.
Offers and launches, sent sparingly so they still mean something.

Write like a person. Use a real name in the "from" field if your business is built on personal relationships, and keep the subject line plain and specific. "Your spring garden checklist" will do more than "April Newsletter Vol. 3".

Measure what matters

Your platform will show you open rates first. Treat them with caution: since Apple introduced Mail Privacy Protection, open rates are inflated and unreliable. Look at clicks, replies, unsubscribes, spam complaints and, most of all, the sales or enquiries your emails lead to. Our guide to reading your email metrics explains each number.

Common mistakes

Buying or renting a list. It breaks most email platforms' terms of service, often breaks the law, and damages your sending reputation. Build your own.
Waiting until you have something big to say. Lists go cold. People forget they signed up, then mark you as spam when you finally write.
Sending everything to everyone. Even simple segments, such as customers versus non-customers, make emails more relevant.
Skipping the welcome sequence. New subscribers are most interested on day one.
Using your everyday inbox. No unsubscribe link, no tracking, and a real risk of getting your normal email flagged.

Frequently asked questions

How often should a small business send email?

As often as you can send something worth reading. Many small businesses do well with one or two emails a month plus automated sequences. If unsubscribes rise sharply after you increase frequency, ease back.

How big does my list need to be before it's worth it?

There's no minimum. A list of a few hundred engaged local customers can be worth more than thousands of strangers. Start sending as soon as you have people who asked to hear from you.

Can I add my customers to my list?

It depends on where they are and how you collected their address. In the US it's usually allowed if you include an unsubscribe link and your address. In the EU, UK and Canada the rules are stricter, so check before importing. Either way, a short "we're starting a newsletter, here's what to expect" first email reduces complaints.