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Email marketing campaigns: the complete guide to planning, sending and improving them

The Coavon team · 9 October 2026 · 22 min read

Email marketing campaigns are still one of the few marketing channels you fully control. You are not renting attention from a social network or bidding against competitors for a click. You are writing to people who asked to hear from you, in a place they check every day, and you can measure what happens next.

That is also why so many campaigns disappoint. The tools make it easy to send an email and hard to send a good one. This guide covers the whole job: what a campaign is, the types worth knowing, how to build a list and reach the inbox, how to plan, write, design and test a campaign, which automations to set up first, and how to read the results honestly. It is written for small and growing businesses, and it does not assume any particular email tool.

Short on time? Jump to the step-by-step plan, the four automations to set up first, or the pre-send checklist.

What is an email marketing campaign?

An email marketing campaign is one email, or a planned series of emails, sent to a defined group of people to achieve a specific goal within a set period. The three parts of that definition matter: a defined audience (not "everyone"), a specific goal (not "stay in touch") and a plan (not whatever comes to mind on Tuesday).

The word "campaign" gets used loosely, so it helps to separate three kinds of email a business sends:

Campaigns and automations are both marketing and need the recipient's permission. Transactional emails are a service the customer expects, and the rules for them are different. A healthy email program uses all three: automations do the steady, repeatable work, campaigns carry what is new, and transactional emails keep customers informed.

Why email is still worth the effort

• You own the audience. A change to a social network's algorithm or an ad platform's prices cannot take your list away.
• It is permission-based. People on your list chose to be there, which makes them far more likely to buy than a cold audience.
• It is measurable. You can see who received, clicked and bought, and connect a campaign to revenue.
• It is inexpensive. Sending costs little, so most of the investment is the thinking and the writing.
• It compounds. A welcome series written once keeps working for every new subscriber, for years.

The catch is that inboxes are crowded and mailbox providers have become strict. Sending more email to more people no longer works. Sending relevant email to the right people does.

Types of email marketing campaigns

Most email marketing falls into a handful of types. Knowing them makes planning faster, because each one has a typical goal, timing and measure of success.

Before you send: permission and the law

Everything else in this guide depends on one thing: the people you email agreed to it. Permission is what makes email work, and it is also what the law requires in most of the world.

Build your list, never buy one

Bought and scraped lists are full of people who never asked to hear from you, addresses that no longer exist, and traps that mailbox providers use to identify spammers. Using one damages your sender reputation, often for months, and in many countries it is illegal. Build your own list instead:

• Sign-up forms on your site: in the footer, on blog posts, and at checkout.
• A reason to subscribe. A discount on a first order, a useful guide or template, early access, or simply a clear promise of what you will send and how often.
• In person: at the till, at events, on a tablet or with a QR code.
• At purchase, with a clearly worded, unticked option to receive marketing.

Single or double opt-in?

With single opt-in, someone is subscribed as soon as they submit the form. With double opt-in, they receive an email asking them to confirm first. Double opt-in gives you a smaller, cleaner list: fewer mistyped addresses, fewer bots and clear proof of consent. Single opt-in gives you a larger list with more risk. If you serve customers in Europe, or you have had deliverability trouble, double opt-in is the safer choice.

The rules, in brief

This is a summary, not legal advice. The rules depend on where you and your subscribers are. When in doubt, follow the strictest rule that applies to your list: get clear consent, say who you are, and make leaving easy.

Deliverability: getting into the inbox

An email that lands in spam might as well not have been sent. Deliverability is the work of making sure mailbox providers such as Gmail, Yahoo and Outlook trust you enough to put your email in the inbox. It comes down to proving who you are and behaving like a sender people want to hear from.

Authenticate your sending domain

Three records in your domain's DNS settings tell mailbox providers that your email is really from you:

• SPF lists the services allowed to send email for your domain.
• DKIM adds a signature to each email so the receiver can check it was not altered.
• DMARC tells receivers what to do when an email fails those checks, and sends you reports.

Since February 2024, Gmail and Yahoo have required these from anyone sending in bulk, along with a one-click unsubscribe in marketing email and a low rate of spam complaints. Microsoft introduced similar requirements for Outlook in 2025. Your email tool will give you the exact records to add. It is a one-time job that takes less than an hour, and it is no longer optional.

Send from your own domain

Send from an address at your own domain, such as hello@yourcompany.com, not from a free address such as a Gmail or Yahoo account. Many senders use a subdomain for marketing (for example news.yourcompany.com) so that a problem with marketing email cannot affect the delivery of everyday business email.

Keep complaints and bounces low

• Spam complaints are the strongest negative signal. Gmail's published limit is a complaint rate of 0.3%; aim to stay well below 0.1%.
• Hard bounces (addresses that do not exist) should be removed automatically. A high bounce rate suggests a stale or bought list.
• Make unsubscribing easy. A person who cannot find the unsubscribe link will press "report spam" instead, which hurts you far more.

Warm up, and clean up

If your domain or email tool is new, start by sending to your most engaged subscribers and increase the volume over a few weeks. Sudden large sends from an unknown sender look like spam. At the other end, stop emailing people who have not opened or clicked in a long time. A smaller list of people who engage will reach the inbox more reliably than a large list of people who ignore you.

How to plan an email marketing campaign, step by step

A campaign that works is usually decided before a word is written. Work through these nine steps in order.

1. Set one goal. Choose a single outcome you can measure: orders of a product, registrations for an event, replies booking a call. A campaign with three goals achieves none of them.
2. Choose the audience. Decide exactly who should receive it, and who should not. A sale on a product makes little sense for people who bought it last week.
3. Define the offer and the message. What are you asking people to do, and why should they do it now? Write it in one sentence. If you cannot, the campaign is not ready.
4. Plan the sequence. Decide how many emails, on which days, and what each one adds. One email is often not enough: people miss it, or mean to come back and forget.
5. Write the emails. Subject line and preview text first, then the body, then the call to action.
6. Design them. Fit the message into your template. Do not let the template decide the message.
7. Test. Send to yourself and a colleague, on a phone and a computer, and click every link.
8. Schedule and send. Choose a time based on when your own audience responds (more on this below).
9. Measure and note what you learned. Compare the result with the goal, and write down one thing to repeat and one to change.

Write a one-page campaign brief

Putting the plan on one page keeps everyone aligned and makes the next campaign faster. A brief only needs to answer these questions:

Segmentation: send the right email to the right people

Segmentation means dividing your list into groups so each one receives email that fits it. It is the single most reliable way to improve results, because relevance is what gets email opened, clicked and kept out of spam. You do not need dozens of segments. Start with a few that reflect real differences in what people want.

A simple and effective first step: stop sending every campaign to your whole list. Send to people who have engaged recently, and send a different, lighter version to the rest. Results per email usually improve, and so does deliverability.

Writing emails people open and act on

The sender name

People decide whether to open based on who an email is from before they read the subject. Use a name they will recognize, and keep it consistent: your company name, or a person plus the company ("Dana at Northwind"). Avoid "noreply" addresses. They tell the reader you do not want to hear back, and replies are a positive signal to mailbox providers.

Subject lines

A subject line has one job: to earn the open honestly. The best ones are specific, short enough to read on a phone, and accurate about what is inside.

• Put the important words first. Phones cut off long subject lines.
• Be specific. Numbers, names and dates beat adjectives.
• Do not mislead. A subject line that tricks someone into opening earns an unsubscribe or a spam complaint, and may break the law.
• Go easy on capitals, exclamation marks and emoji. One, used well, is fine. Several look like spam.

Preview text

The preview text is the line shown beside or beneath the subject in the inbox. If you leave it empty, the inbox fills it with whatever comes first in the email, often "View in browser". Write it deliberately, as a second subject line that adds to the first instead of repeating it.

The body

• One email, one goal. Every sentence should lead toward the one action you want.
• Lead with what matters to the reader, not with news about your company.
• Write the way you would to one person. "You" and "we", short sentences, plain words.
• Make it easy to scan. Short paragraphs, a clear heading or two, and bold for the few things that must not be missed.
• Keep it as long as it needs to be. A sale needs a few lines. A guide can be long if every part earns its place.

The call to action

Use one main call to action, as a button, with words that say what happens when it is pressed: "Shop the autumn range", "Reserve my seat", "Read the guide". "Click here" and "Learn more" say nothing. Repeat the same action lower down in a long email, but do not offer five different things to do.

Personalization that is actually personal

Adding a first name to the subject line is the weakest form of personalization. The useful kind changes what the email says based on what you know: products related to a past order, content matched to stated interests, a reminder timed to when a product usually runs out. If you do use names, set a fallback so nobody receives "Hi ,".

Email design and accessibility

• Design for the phone first. A large share of email is read on a small screen. Use a single column and text large enough to read without zooming.
• Keep the width to about 600 pixels, the size most email programs display well.
• Make buttons easy to tap: large, with space around them.
• Do not put the message in an image. Many email programs block images until the reader allows them, and screen readers cannot read text inside a picture. Use real text, and add a description (alt text) to every image.
• Check contrast and dark mode. Text must be readable against its background, and logos with transparent backgrounds can vanish in dark mode.
• Keep the email light. Gmail cuts off messages larger than about 102 KB and hides the rest behind a link, which can hide your unsubscribe link too.
• Always include your company name, postal address and an obvious unsubscribe link in the footer.

A plain, well-written email often does as well as a heavily designed one, and sometimes better, because it reads like a message from a person. Let the type of email decide: a product launch benefits from images, a note to customers about a change does not.

When to send, and how often

There is no universal best time to send email. The studies that name one are averages across millions of senders with different audiences, and your customers are not an average. A business that sells to other businesses usually does better on weekday working hours; a shop selling to the public may do better in the evening or at the weekend. The only reliable answer comes from your own results: send at a few different times over several weeks and compare clicks and sales, not just opens.

Frequency works the same way. The right amount is as often as you have something worth sending, at a pace you can keep up. As a starting point:

• A newsletter weekly, fortnightly or monthly. Consistency matters more than the interval.
• Promotions when you have a real one. A permanent sale stops being a reason to act.
• More to people who engage, less to people who do not. Engagement, not the calendar, should set the pace.

Watch unsubscribes and spam complaints after each send. A rise in either is the clearest sign you are sending too often or to the wrong people. Better still, offer a preference center where subscribers can choose topics or a lower frequency instead of leaving altogether.

The four automations to set up first

Automations are written once and then run for every person who qualifies. They tend to produce more revenue per email than one-off campaigns, because they arrive at the moment someone is paying attention. If you set up nothing else, set up these four.

1. Welcome series

New subscribers are at their most interested in the first days. A welcome series makes use of that.

2. Abandoned cart

3. Post-purchase

4. Win-back

The last step matters. Removing people who do not respond feels like losing subscribers, but it protects your reputation with mailbox providers and makes every future campaign more likely to reach the people who do want it.

Example: a product launch campaign from start to finish

Here is how the pieces fit together for a small online shop launching a new range to existing customers. The goal is 150 orders in the first week.

Notice three things. Each email has one job. The later emails go only to people who have not yet acted, so customers who bought on day one are not asked again. And the deadline is real: the free delivery does end, which is what gives the last email its force.

Testing your emails

A/B testing

An A/B test sends two versions of an email to small parts of your list and compares the results, then sends the better one to everyone else. It is worth doing, with three rules:

• Change one thing at a time. If the subject line and the button both change, you cannot tell which made the difference.
• Judge by the goal. A subject line that gets more opens but fewer sales has not won. Compare clicks or orders where you can.
• Do not read too much into small numbers. A difference of a few clicks on a list of a few hundred is noise. With a small list, test the same idea across several sends before trusting it.

Good things to test, roughly in order of impact: who the email goes to, the offer, the subject line, the call to action, the layout, the sending time.

Measuring email marketing campaigns

Measure a campaign against the goal you set at the start. These are the numbers worth knowing, and what each can and cannot tell you.

Why open rates can mislead

Opens are counted by loading a tiny hidden image. Since 2021, Apple's Mail Privacy Protection has loaded those images automatically for people who use Apple Mail, whether or not they read the email. That inflates open rates and makes them unreliable for judging subject lines or deciding who is "engaged". Use opens as a rough guide only, and base decisions on clicks, replies and purchases.

A worked example

Suppose a campaign is sent to 5,000 people. 4,900 are delivered, 196 people click and 49 place an order, with total sales of 3,430 in your currency.

• Delivery rate: 4,900 ÷ 5,000 = 98%
• Click rate: 196 ÷ 4,900 = 4%
• Conversion rate: 49 ÷ 4,900 = 1%
• Revenue per recipient: 3,430 ÷ 4,900 = 0.70

These figures are only to show the arithmetic. What counts as a good result varies widely by industry, list and type of email, so the most useful comparison is with your own previous campaigns, not with a published average.

Common mistakes in email marketing campaigns

• Sending everything to everyone. The fastest route to low engagement and spam complaints.
• No clear goal. If you cannot say what the email is for, the reader will not know either.
• Buying a list. It damages deliverability and may be illegal.
• Skipping authentication. Without SPF, DKIM and DMARC, your email may not arrive at all.
• Hiding the unsubscribe link. People who cannot leave will report you as spam.
• Putting the whole message in an image. It may never be seen.
• Too many calls to action. Offer five things and people choose none.
• Sending and forgetting. A campaign you do not review cannot improve the next one.
• Never removing inactive subscribers. A large, silent list drags down delivery for everyone on it.
• Relying on campaigns alone. Without a welcome series and cart reminders, you are leaving the easiest results on the table.

A 30-day plan for your first email marketing campaign

The pre-send checklist

Run through this before every send. It takes five minutes and catches the mistakes that are embarrassing to fix afterwards.

1. The goal of the email is clear, and the email asks for one thing.
2. The audience is right, and people who should not receive it are excluded.
3. The sender name is recognizable and the reply address is monitored.
4. The subject line is specific and accurate, and the preview text is written.
5. Names and other personal details have a fallback for when they are missing.
6. Every link has been clicked and goes to the right page.
7. Images have descriptions, and the email makes sense with images switched off.
8. It reads well on a phone and in dark mode.
9. Prices, dates, codes and deadlines have been checked against the website.
10. The footer has your company name, postal address and a working unsubscribe link.
11. A test has been sent to yourself and one other person.
12. The send time and time zone are correct.

Running email campaigns as a team

The hard part of email marketing is rarely the sending. It is the work around it: agreeing the plan, writing and reviewing the copy, getting the design done, checking the details and remembering to look at the results. When that lives in scattered documents and chat threads, launches slip and mistakes get through.

Coavon is not an email sending tool, and it works alongside whichever one you use. What it gives you is one place to run the campaign: plan each campaign as a project in Flow, with a task, an owner and a date for every step, and see every send on a calendar. Write and review the copy together in Docs, keep the images and exports in Drive, and save your best-run campaign as a project template so the next one starts with every step already listed. For the routine steps, see our guide to workflow automation.

Frequently asked questions

What is the difference between an email campaign and an email automation?

A campaign is sent once, to a group you choose, at a time you choose, such as a sale announcement. An automation is set up once and then sent to each person individually when they meet a condition, such as subscribing or leaving items in a cart. Most businesses need both.

How often should I send email marketing campaigns?

As often as you have something worth sending, at a pace you can keep up. Many small businesses do well with a regular newsletter weekly to monthly, plus campaigns for real promotions and launches. Watch unsubscribes and spam complaints: if they rise, send less or segment more.

What is a good open rate or click rate?

It varies too much by industry, audience and type of email for a single number to be useful, and open rates in particular are inflated by privacy features in Apple Mail. Compare each campaign with your own previous results, and judge by clicks and sales more than opens.

Do I need permission to send marketing emails?

In practice, yes. In the European Union, the United Kingdom and Canada you generally need consent before sending marketing email. In the United States the CAN-SPAM Act does not require prior consent but does require a working opt-out, an accurate sender and subject line, and a postal address. Sending only to people who asked to hear from you is also what keeps your email out of spam.

How many emails should a campaign have?

Often more than one. A typical promotion or launch uses three or four: a teaser or announcement, the main email, a reminder to people who did not open, and a last-chance email before the deadline. Later emails should go only to people who have not yet acted.

Should I use plain-text or designed emails?

Use what fits the message. Product launches and promotions benefit from images and a designed layout. Personal notes, updates and many newsletters do as well or better as simple, mostly text emails. Either way, the email should still make sense with images switched off.

How do I stop my emails going to spam?

Authenticate your domain with SPF, DKIM and DMARC, send only to people who opted in, make unsubscribing easy, remove addresses that bounce or never engage, and send email people want. Mailbox providers decide mostly on how recipients react to your email.

How big does my list need to be to start?

There is no minimum. A list of a few hundred people who chose to hear from you is worth more than tens of thousands who did not. Start with what you have, set up a welcome series, and grow from there.

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