Email marketing is the practice of sending messages to people who asked to hear from you. Somebody hands over an address, you send something worth opening, and some of those people buy. That is the whole of it.
The idea is simple, but the habit is not. You have to earn the address honestly, write something useful, and stop when a person clearly stops caring.
What email marketing is, and what it is not
Email marketing means messages you send to a list you own, for a commercial reason. A monthly newsletter counts. So does a reminder that a basket is still waiting, and a short sequence that runs after somebody signs up.
It does not mean buying a spreadsheet of addresses and mailing strangers. That is spam, and it quietly ruins your ability to reach anybody at all. Nor does it mean one to one sales email, which is a different job with different rules.
Because the list is the asset, every section below comes back to it. Look after the list and the channel keeps working for years. Abuse it and nothing else here will matter.
Why email marketing still earns its place
There are three reasons, and none of them is nostalgia.
- The address belongs to your business, rather than to a platform that can change its rules next month.
- People open an inbox on purpose, so your message waits there until they look.
- Reaching the same person again costs almost nothing, while a paid channel charges you for every visit.
That last point is the one most owners underestimate. Paid search and paid social charge again each time somebody comes back. Email marketing charges once, when you earn the address, and then keeps the door open.
The channels email marketing sits alongside
Email is not a replacement for search or social. Instead it does a job those channels do badly, which is talking to people who already know you.
| Channel | Who it reaches | Who controls access | Cost of reaching again |
|---|---|---|---|
| Email marketing | People who gave you an address | Your provider and the inbox filter | Almost none |
| Search advertising | Somebody looking right now | The auction | You pay for every click |
| Social posts | Some of your followers | The platform | Free to post, though the platform picks who sees it |
| Text messages | People who gave a number | The carrier and the regulator | Usually a fee for each message |
Read that as a division of labour rather than a league table. Search finds strangers. Social keeps you in view. Email turns an interested stranger into somebody who buys twice.
The list, which decides everything else
A list is not a count of addresses. It is a count of people who would notice if you stopped writing.
Where good addresses come from
Every honest source shares one feature. The person knew what they were signing up for. A box at the checkout, a form on the site, a useful download, an event, or a counter in a shop.
Vague promises collect addresses that never open anything. "Join our mailing list" tells a reader nothing. "One short note a month, with what changed in our prices" tells them exactly what will arrive. There is more on this in our guide to email list building.
Why a bought list fails
A bought list looks like a shortcut and behaves like a fine. Nobody on it agreed to hear from you, so a good number of them will press the spam button.
Inbox providers watch that behaviour closely. Once enough complaints arrive, your later messages land in junk, including the ones going to people who did want them. Therefore the shortcut costs you the very asset you were trying to build.
The kinds of email marketing you will actually send
Three shapes cover almost everything, and each suits a different moment.
Broadcasts
A broadcast goes to a segment on a date you choose. Newsletters, offers and announcements all live here. They are easy to start and easy to overdo.
Automated sequences
An automation runs when somebody does something. Examples include a welcome series after a signup, a nudge after an abandoned basket, and a check in after a first order. Once written, it keeps running without anybody pressing send, which is why email automation usually repays the effort first.
Transactional messages
Receipts, dispatch notes and password resets are not marketing, yet people open them because they are waiting for them. Keep them clear and quick. One small relevant line at the bottom is fine, but a sales pitch inside a receipt is not.
Getting into the inbox at all
None of the writing matters if the message lands in junk. Deliverability is the unglamorous half of the channel.
Start with the technical records that prove you may send from your domain. Your provider will name them, and it is a setup job you do once. After that, the rest is behaviour.
- Send to people who signed up recently enough to remember doing so.
- Remove addresses that have ignored you for a long stretch.
- Make the unsubscribe link obvious, because a complaint hurts far more.
- Warm a new sending domain slowly instead of mailing everybody on day one.
Our guide to email deliverability goes further. In short, inbox providers reward senders whose messages people actually want.
What email marketing measures, and in what order
The numbers form a chain, and reading them out of order causes most bad decisions.
Delivery tells you whether the message arrived. Opens hint at whether the subject line worked, though some inboxes load the tracking image on a reader's behalf, so treat opens as a soft signal. Clicks tell you whether the content earned attention. Then orders, enquiries or replies tell you whether the send was worth making.
Unsubscribes and complaints sit alongside those as the cost side. A campaign that sells well and burns a chunk of the list has not really won.
A worked example, with round numbers picked to make the arithmetic easy rather than to describe a typical result. Send to one thousand people. Two hundred open it, forty click, and four buy something worth fifty each. The send earned two hundred, and each buyer came from ten clicks. Change the subject line and the click figure moves. Change the offer and the buyer figure moves. That is the diagnostic loop in one paragraph.
Report on the same measures every month. Consistency is what turns a number into a trend, and a trend is the only thing you can act on. There is more detail in the email marketing metrics worth reporting.
Segmentation, and why a small list still works
Segmentation means sending different things to different people. It costs nothing but attention, and it needs no clever software.
Split by what somebody has done, rather than by who you imagine they are. Bought once. Bought three times. Signed up but never bought. Quiet for months. Each group deserves a different message, and each one is easy to define.
Small lists gain from this too, which surprises people. When you have few people, a message written for all of them fits none of them. See how email segmentation earns its keep for the practical version.
Writing an email somebody reads to the end
Write to one person. Say the useful thing first. Ask for one action.
Subject lines work when they describe what is inside, so avoid the tease that promises more than the message delivers. The first line matters nearly as much, since many inboxes show a preview of it.
Keep the body short enough that a reader on a train finishes it. If you need length, put the point at the top and the detail underneath. Finally, offer one clear button instead of five competing links.
Design, and the phone in somebody's hand
You do not get to choose the screen your message opens on. So design for the narrow one first, then check the wide one afterwards.
Single column layouts survive everywhere. Large type survives everywhere. Images should support the message rather than carry it, because plenty of inboxes hide them until a reader chooses otherwise.
Send yourself a copy before every campaign goes out. Read it on a phone, in the dark, with images off. Whatever survives that is safe to send.
How often to send, and how to decide
There is no correct frequency. There is only the rhythm you can sustain and your readers will tolerate.
Pick one you could hold for a year with the people you actually have. Weekly needs something to say every week, whereas monthly needs something worth waiting for. Then watch unsubscribes and complaints instead of guessing.
Seasonal businesses can lean harder in season, provided they stay in touch out of it. A list that hears from you twice a year has usually forgotten you by the second time.
Consent, records and the unsubscribe link
Rules differ by country and they change, so treat this section as a prompt to check rather than an answer. Your own regulator, or a solicitor who knows your trade, is the place to settle what applies to you.
Three habits are worth keeping whatever your rules say. Ask before you add somebody. Record the signup wording, the date and the source against each address. Then honour an unsubscribe quickly, and never make anybody sign in to leave.
Beyond the law, there is a practical argument. A person who leaves cleanly might come back later. A person who reaches for the spam button is unlikely to.
Choosing email marketing tools without overthinking it
Every platform sends email. The differences that matter are narrow, so judge them on four things.
- Whether it connects to your shop or booking system without a developer.
- How easy the automation builder feels to the person who will use it daily.
- What happens to your data if you leave, and how the export works.
- Price steps as the list grows, because those bite later rather than now.
Beyond that, the choice matters less than people expect. A team that understands its list will do better on plain software than a team that does not will do on expensive software. Our guide to choosing email marketing tools covers the trade offs.
How email marketing fits with everything else
Treat it as the retention half of your marketing. Other channels bring people in, while this one keeps them.
So the join between them matters. A paid campaign that collects an address is worth more than one collecting only a sale, since the address lets you sell again. Similarly, content that answers a real question gives somebody a reason to subscribe.
Where a shop sells to the same customers repeatedly, this is where the quiet profit usually sits. Our guide to ecommerce email marketing goes into that.
Where email marketing is the wrong tool
It cannot create demand from nothing. If nobody knows your business exists, you have no addresses to write to, and the answer is a channel that reaches strangers.
It also struggles when purchases repeat rarely. Somebody who buys a boiler once a decade does not want a note every month. In that case a short useful sequence beats an ongoing newsletter.
And it makes a poor rescue plan. Mailing an old, cold list to fix a bad month usually produces complaints instead of orders. Rebuild the habit slowly.
Testing, without pretending you have a big list
Most testing advice assumes an audience larger than yours. So start with the version that fits the list you actually have.
Change one thing at a time. Otherwise a better result cannot tell you which change caused it. Run the next test on the next send, rather than splitting a small list in two.
Then judge the size of the difference honestly. A change you can see without squinting is worth keeping. Anything finer than that needs more people than a small list contains, so put the effort into the offer instead.
Keep a short record of what you tried and what happened. Testing in email marketing is less about statistics than about changing one thing and watching. Memory rewrites results, whereas a line in a spreadsheet does not.
A first ninety days that will not embarrass you
Start narrow. Pick one signup point and make its promise specific. Then set the sending records up properly so your messages arrive.
Write a welcome sequence of a few messages next, because that is the moment when interest runs highest. After that, send one regular broadcast on a rhythm you can keep. Monthly done well beats weekly abandoned.
Review after three months against the same measures each time. If something moved, do more of it. If nothing moved, change the offer before you change the software, since email marketing tools rarely turn out to be the constraint.
That is email marketing in practice. Fewer tricks than the vocabulary suggests, and a great deal more patience.
Read the rest of this guide
Frequently asked questions
What is email marketing in simple terms?
It is sending commercial messages to people who gave you their address and agreed to hear from you. A newsletter counts, and so does an automatic reminder about an abandoned basket. Two things get confused with it and are not the same job. Mailing a bought list is spam, and it damages your ability to reach anybody at all. One to one sales email is a separate craft with its own rules. What is left is a channel you own rather than rent.
Does email marketing still work?
Yes, though the reason is duller than the usual pitch. Email marketing works because the inbox is somewhere people go on purpose, so a message waits there until they look. It also works because you already earned the address, which means you are not paying a second time to reach somebody who knows you. What it cannot do is make a weak offer good, or invent interest that was never there.
How do I get people onto my list without buying one?
Ask, in the places where people already deal with you, and say exactly what will arrive. The promise does the work here rather than the form. A vague invitation to join a mailing list collects addresses that never open anything, whereas a specific one collects fewer and keeps almost all of them. Give people an obvious way out at the same time, since an easy exit is what stops a signup turning into a complaint months later.
Is it legal to email customers who already bought from me?
That depends on where you and your reader are, so check your own regulator before you rely on any answer you read online, including this one. Some countries treat an existing customer differently from a stranger, and some do not. The practical protection is the same either way. Whatever somebody agreed to, save the wording, the date and where the address came from. A complaint is much easier to answer when you can show what was on the screen at the time.
How often should I email my list?
As often as you have something worth sending, and no more. Frequency is less about a number than about supply. If you struggle to fill a weekly slot, the weekly slot is wrong for you. Choose the rhythm you could still hold in a busy month, then let unsubscribes and complaints tell you whether it is too much. A schedule you abandon costs you more than a slower one you keep.
Why do my emails land in the spam folder?
Usually because of behaviour rather than wording. Inbox providers watch how people react to you, so complaints, dead addresses and long silences all push you towards junk. Start with the sending records your provider asks for, because they prove the mail really comes from your domain. After that, the strongest lever is who you send to rather than what you write. Recent and willing readers keep you out of junk, while long ignored addresses do the opposite.
Are open rates a reliable measure?
Not on their own. Privacy features on some devices load the tracking image whether or not a person looked at anything, which inflates the figure. Treat opens as a soft signal about the subject line and nothing more. Clicks are firmer. Orders, enquiries and replies are firmest of all, so judge a campaign on the thing you wanted it to cause.
What should I measure in email marketing?
Measure the thing you wanted the send to cause, then work backwards when it disappoints. Orders, enquiries or replies sit at the end of that chain, and clicks, opens and delivery tell you where it broke. Compare a send against your own earlier sends rather than against a figure you read somewhere, since your list and your offer are what actually vary. Email marketing rewards a steady monthly report far more than a clever dashboard nobody opens.
Which email marketing tools suit a small business?
Almost any of the well known ones will send your mail, so pick on fit rather than on the feature list. The question worth asking is who will use it every week, and whether that person can build a simple automation without help. Check that it joins up with your shop or booking system, and that you can export your list and walk away. Email marketing tools are rarely the reason a programme works or fails.
When is email marketing not worth doing?
When you have nobody to write to, or nothing to say to them. Email marketing works on interest that already exists, so a business nobody has heard of needs a channel that reaches strangers first. It also fits badly where somebody buys once and then not again for years. If you already hold a list you have ignored for a long time, the honest first step is a small plain message to the most recent part of it, rather than a big offer to all of it.