Picture this: one Thursday in 1978, a marketer named Gary Thuerk pressed “send” on a single email to just 400 people. That tiny blast sold so many computers that the final tab reached roughly $13 million....
…One email, 400 readers, mountains of money—proof that learning how get products through email marketing can still work like magic today.
Computerworld later reported the eye-popping result, cementing the tale as email’s original success story. The takeaway is simple: you do not need a stadium-sized list to win. What you need is the right message landing in the right inbox at the right moment.
“The promotion generated about $13 million in sales.” — Computerworld
If 400 emails once did that, what could your list do? While social ads rise and fall in price, email quietly keeps its crown as the channel that lets you speak straight to people who already said, “Yes, I want to hear from you.” Stick around and we will show you how to repeat the 1978 trick with 2025 tools.
Why Email Still Delivers 3,600% ROI in 2025
Gary’s 1978 blast to 400 inboxes pulled in $13 million, and the channel keeps getting richer. In 2023 the global email marketing pie was worth $8.3 billion; by 2028 it’s expected to hit $18.9 billion. That’s more than double in just five years, proving the oldest online tool is still the hungriest money maker.
Picture ROI like a lemonade stand: spend one dollar on lemons and sugar, get thirty-six dollars back in cup sales. That 3,600% return is exactly what smart email marketers see today. While social feeds fill up with noise, the humble inbox keeps quietly cashing in.
Social platforms come and go, but email sits on three times more accounts than Facebook and Twitter combined. Add a 6× higher click-through rate than Twitter and the choice is clear: email still wears the revenue crown.
The Statista market value jump from $8.3 billion to $18.9 billion isn’t just a fancy number. It means more brands are shifting budget into email, confident the 3,600% return will keep showing up like clockwork.
Of course, the giant ROI only shows up if people open the message. A shiny subject line is the key that turns the lock, and that’s where the next bit of magic happens.
Craft Subject Lines that Get 26 Percent More Opens
Adult attention spans now last just eight seconds. That blink-quick window is all the time your subject line gets to win the open or sink into the trash. Make those seconds count by turning your next headline into a friendly wave instead of a whisper in the crowd.
A Campaign Monitor test proved that personalized subject lines lift opens by 26 percent. Swapping generic greetings for the reader’s first name is the fastest way to grab that boost. Most email platforms let you drop in a first-name tag so “Hey, friend” becomes “Hey, Maya” without extra typing.
New
Free
Alert
Easy
Win
Power words like the ones above act like tiny spotlights inside the inbox. YesWare studied 115 million campaigns and found these five words raise open rates because they promise value, speed, or a little excitement. Slip one or two into your next subject and watch the difference.
Keep the line short, ideally under forty characters, so nothing gets cut off on phones. Ask a question or tease a benefit instead of giving everything away. Pair the hook with the first-name tag and you have a 26 percent open boost working in your favor.
Even the greatest subject line is wasted if the message lands in the spam folder. In the next section you will learn the simple compliance steps that keep your emails welcomed by inboxes everywhere.
Flat lay Christmas decoration Office workplaceHow to Get Products Through Email Marketing: 2025 Starter Guide
Stay Legal: CAN-SPAM, GDPR and the 10-Day Rule
A single slip can cost thousands in fines, but staying on the right side of the rules does more than keep auditors happy. Clean compliance lifts your sender reputation, so mailbox providers let more of your messages land in the inbox instead of the spam folder.
The CAN-SPAM Act sets the US standard. Its headline rule is simple: once someone hits unsubscribe, you have 10 business days to stop every marketing email to that address. Miss the deadline and each extra message can trigger penalties that stack up fast.
GDPR compliance works a little differently. It asks for clear, freely given consent before you add anyone in the EU to your list. Pre-checked boxes are out; a plain yes is in. Keep a timestamped record of that consent and give people an easy way to withdraw it.
Good news: following these steps actually boosts your numbers. Lists that honor quick opt-outs and clear consent get fewer spam complaints, so inbox filters trust you more. Higher trust means higher deliverability, which means more eyes on every offer you send.
Three-step checklist for lawful email capture and unsubscribe handling
Use a double opt-in form: visitor enters an address, then clicks a confirmation link so you have proof of consent.
Store the proof: save the signup IP, date, time, and the exact wording of the consent box.
Honor the 10-day rule: process every unsubscribe within 10 business days, then send a final confirmation so the user knows it worked.
Keep your forms friendly and your records tidy. When people see you respect both their inbox and the law, they stick around longer, click more, and even forward your emails to friends.
Even the most legal list still needs living, breathing readers. Next up: how to keep those readers engaged so your perfectly compliant messages turn into real sales.
Build a List That Prefers Email Over Social by 70%
Three times more people own email accounts than Facebook and Twitter combined. That alone tells you where real attention lives. Add the fact that 70% of shoppers still pick email as their favorite way to hear from brands, and the choice is clear: grow a list of willing inboxes first, followers second.
The fastest polite way to collect those inboxes is the exit-intent pop-up. When a visitor’s mouse heads for the close button, a small window offers a quick reason to stay in touch. Tests show this last-second ask lifts sign-ups by 46%. The trick is to match the gift to the page: a one-page checklist on a blog post, a five-dollar coupon on a product page, or early-bird access on an event page.
You can set the whole dance on autopilot with Mailchimp. Inside the pop-up builder, toggle the exit-intent trigger, then tell Mailchimp to tag every new address with the page name and date. These tags flow straight into your audience dashboard, so each subscriber arrives already labeled for future email list segmentation. No spreadsheets, no copy-paste, no forgotten names.
Sync exit-intent pop-ups with Mailchimp for automatic tagging
First, open your pop-up tool and pick the exit-intent option. Next, connect the tool to Mailchimp using the built-in integration; most builders ask only for your API key. Finally, add a hidden field called “source” and fill it with the page slug. Mailchimp will read that field and drop a tag like “blog-lead-magnet” or “shop-exit” on every contact. The moment someone joins, they are sorted and ready for targeted welcome sequences.
Big numbers feel great, but a bloated list helps no one. A messy pile of addresses drags open rates down and spam complaints up. Clean beats huge every time. In the next step you will see how email list segmentation turns that tidy new list into the profit engine that drove the famous 1978 blast from 400 readers to thirteen million in sales.
Segment for the 58% Revenue Bump
Lots of people think blasting every subscriber at once is the quickest way to cash. The numbers tell a happier story: segmented emails quietly pull in 58% of all email revenue, according to the DMA. A single list-wide shout may feel fast, but slicing that list turns the same send into a profit engine.
Segmentation does not need fancy software. Start with two buckets: new customers and returning customers. New buyers greet a welcome series; repeat buyers see loyalty perks. That tiny split alone can lift opens, clicks, and, most important, sales.
Campaign type Average open rate Average click rate
Non-segmented 18% 2.3%
Segmented 32% 4.4%
The inside track shows segmented campaigns boosting revenue 76% over one-size-fits-all blasts. Try other easy cuts: geography, last purchase date, or favorite product category. Each slice lets the message feel hand-written, so subscribers click instead of swipe away.
Ready for more ideas? Our full segmentation playbook lives in the next chapter. Flip the page and learn exactly what to send each slice so every subscriber feels like the email was typed just for them.
Send Emails That Get 42% More Clicks With Images
People forget nine out of every ten words they read, yet they remember almost two thirds of what they see. That memory gap is why plain-text blasts rarely stick, but a bright photo or quick GIF can anchor your offer in a reader’s mind long after the inbox scroll ends.
Add a single engaging image and your click rate can leap 42%. The trick is pairing the right picture with mobile email design that looks good on the small screen, because 41% of opens happen on phones. When your hero shot loads fast and your button sits where thumbs can tap, you turn casual glances into solid clicks.
Quick mobile design checks
Finger-friendly buttons: at least 44 px tall
14-pt font so no one squints
Single-column layout so nothing squishes
Start with one crisp visual that answers the reader’s unspoken question: what’s in it for me? A lifestyle shot of your product in action beats a logo every time. Keep the file slim, under 100 KB, so it pops open even on slower connections.
Next, give the image a job. Place your click-worthy button right below the visual so the eye travels in one smooth line. Light backgrounds keep text readable in sun glare, and plenty of white space keeps thumbsfrom tapping the wrong link.
Even the prettiest email still needs a test run. Try two versions of the same message, swap the hero image or button color, and let a small slice of your list vote with their clicks. The winner tells you what your bigger audience wants to see next.
Test, Track, and Scale Your Way to $13 Million 2.0
Remember Gary Thuerk’s tiny 1978 list of 400 people that turned into $13 million? You can beat that record, because today you have A/B testing, Google Analytics, and a clear shot at the same 3,600% ROI. Start small, test weekly, and reinvest every extra dollar into growing your list.
A/B testing is your fast track to bigger paydays. Try two subject lines: one plain, one with a power word or number. Send each version to 10% of your list, wait four hours, and let the winner ride to the rest. The same trick works for call-to-action buttons: red or green, “Shop Now” or “Grab Yours.” One recent tweak lifted clicks 127%—proof that tiny words create huge jumps.
Google Analytics closes the loop. Tag every email link with a simple UTM code so you can see exactly which message drove each sale. When the dashboard shows a campaign beating your 3,600% ROI benchmark, pour the profits back into list growth: exit-intent pop-ups, social ads, or a giveaway. The money snowballs while you sleep.
Keep the cycle rolling: test, track, reinvest, repeat. Each week brings a fresh experiment and a fatter return. Thuerk had punch cards and a prayer; you have real-time data and automation. Your list is waiting—go make your own $13 million tale.
Disclaimer: The prices mentioned in this article are based on publicly available data and reflect the prices as of [Jul 8, 2026]. Prices are subject to change without notice. This information is provided for general informational purposes only. No rights may be derived from it, and we disclaim all liability for any actions or decisions based on this content.