How to Write a Marketing Email That Actually Gets Opened
Wondering how to write a marketing email that people actually open? Here is the short answer: earn the open with a short, specific subject line sent from a recognisable name, then keep the promise inside with one clear message and one clear call to action. Everything else — timing, design, personalisation — helps, but those two things do most of the work.
That sounds simple, and it is. But most marketing emails fail before they are ever read, because they look like every other email in the inbox: a vague subject line, a wall of text, and three competing links. This guide walks through the full process — subject line, preview text, body, call to action, and the technical basics that decide whether your email reaches the inbox at all.
Why most marketing emails never get opened
Most industry benchmark reports put average email open rates somewhere in the low-to-mid twenties as a percentage, with wide variation by industry — nonprofits and government tend to sit higher, while marketing and retail promotions sit lower. In other words, for a typical list, roughly three out of four recipients never open a given email.
One important caveat before you obsess over that number: Apple Mail Privacy Protection pre-loads emails on many devices, which registers an "open" even when nobody read anything. Open rates are still useful for comparing your own subject lines against each other, but treat clicks and replies as the truer measure of whether an email worked.
The recipients who do open are making a split-second decision based on exactly three things they can see: who the email is from, what the subject line says, and the preview text next to it. So that is where the writing starts.
Start with the sender name, not the subject line
People open email from senders they recognise and trust. Before you polish a single subject line, get these right:
- Use a real, consistent sender name. "Rishabh from RG" or your brand name — not "noreply" and not a name that changes every campaign.
- Send from a domain you own. A free webmail address makes marketing email look amateur and hurts deliverability.
- Be someone worth hearing from. If your last five emails were pure sales pitches, your open rate is paying for it. Useful emails train people to open the next one.
How to write a subject line that gets the open
The subject line has one job: make the open feel worth two seconds of attention. It is a headline, not a summary.
Keep it short and front-load the point
Mobile email clients cut subject lines off early — often around 30 to 40 characters. Put the most important words first so the point survives truncation. Shorter subject lines also tend to feel more personal and less like a broadcast.
Be specific, not clever
"A quick way to reuse your best content" beats "You won't believe this trick!" every time. Specificity signals that there is a real, concrete payoff inside. Curiosity works only when it is anchored to something the reader cares about.
Write like a person
Sentence case or lowercase generally reads as more human than Title Case. ALL CAPS and stacked exclamation marks read as spam — to both humans and filters. The test: would this subject line look normal coming from a colleague?
Avoid spam-trigger patterns
Words and patterns like "FREE!!!", "$$$", "act now", and "100% guaranteed" are classic spam-filter triggers. One risky word will not doom you, but combining them with all caps and multiple exclamation marks very well might.
Subject line makeovers
| Weak subject line | Stronger version | Why it works |
|---|---|---|
| Our March Newsletter | 3 pricing mistakes we see every week | Specific payoff instead of a label |
| HUGE SALE — DON'T MISS OUT!!! | Your 20% code ends Sunday | Concrete offer, real deadline, no shouting |
| Checking in | Quick question about your website | Relevant and personal, not vague |
| New Product Announcement | The tool that cuts invoicing to 5 minutes | Leads with the benefit, not the news |
Use the preview text — do not waste it
Preview text is the grey snippet shown after the subject line, and it is effectively a free second subject line. If you do not set it, email clients pull the first text they find — often "View this email in your browser," which persuades no one.
Write preview text that extends the subject rather than repeating it. If the subject is "Your 20% code ends Sunday," the preview can add "Works on everything, including new arrivals." Together they make a two-part pitch.
Writing the body: one email, one job
The biggest body-copy mistake is trying to do everything at once — announce a product, share three blog posts, promote a webinar, and ask for a referral in the same email. The reader, skimming on a phone, does none of it.
Decide the single action you want before you write a word. Then structure the email to make that action easy:
- Open with the reader's problem or interest, not your news. "We've been working hard on..." is about you. "If invoicing eats your Friday afternoons..." is about them.
- Keep paragraphs to one to three sentences. Long blocks of text get skimmed past on mobile, where most email is read.
- Write like you talk. Read it aloud; if a sentence sounds unnatural spoken, rewrite it.
- Make it scannable. Short subheads, a list where it helps, bold on the one line that matters.
- Cut the throat-clearing. "We hope this email finds you well" delays the point. Get to it.
The call to action: one link, stated plainly
Every extra call to action dilutes the main one. Pick one primary action and make it unmissable — a button or clearly styled link with a label that says what happens next: "Get the checklist," "See the pricing," "Book a 15-minute call." Generic labels like "Click here" or "Learn more" tell the reader nothing.
It is fine to repeat the same call to action twice — once mid-email and once at the end — as long as both point to the same place. What you want to avoid is three different asks competing with each other.
Deliverability: the part most guides skip
None of the writing matters if the email lands in spam. Since 2024, Google and Yahoo have enforced formal requirements for bulk senders — generally those sending around 5,000 or more emails a day to their users — and the bar keeps rising. Even smaller senders benefit from meeting the same standard:
- Authenticate your domain with SPF, DKIM, and DMARC records. Most email platforms (Mailchimp, Klaviyo, Brevo and others) walk you through this in their settings.
- Offer one-click unsubscribe and honour it promptly. Making people hunt for the unsubscribe link earns you spam complaints instead.
- Keep spam complaints very low. Google's enforcement threshold is a 0.3% complaint rate, and it recommends staying under 0.1%. In practice that means only emailing people who genuinely opted in.
- Clean your list. Regularly remove addresses that have not engaged in months. A smaller, engaged list beats a big, cold one for both deliverability and results.
Test one thing at a time
Almost every email platform offers A/B testing on subject lines. Use it — but change one variable per test: question versus statement, with a number versus without, short versus long. Run each test on a meaningful sample, and judge by clicks as well as opens, since open tracking is noisy.
Keep a simple log of winners. After ten sends you will have something better than any generic best-practice list: evidence of what your audience opens.
A quick checklist before you hit send
- Subject line: short, specific, front-loaded, no spam-trigger formatting
- Preview text: written deliberately, extends the subject line
- Body: one message, short paragraphs, reader-first opening
- Call to action: one primary link with a concrete label
- Sent from a recognisable name on your own authenticated domain
- Unsubscribe link present and easy to find
- Test email sent to yourself and read on a phone first
Email rewards consistency more than brilliance. A plain, useful email sent reliably to people who asked for it will outperform an occasional masterpiece sent to a cold list — and each good send makes the next open a little more likely.
If you are building out the rest of your marketing alongside email, our guides to social media marketing for small business and SEO basics for a new website pair well with this one — email works best as part of a system that keeps bringing people back.
Want a second pair of eyes on your email campaigns? Get in touch — happy to take a look.