Why Email Is Still the Highest-ROI Channel Nobody's Using Enough

Abstract

Email marketing's return on investment is one of the most consistently, independently documented figures in all of digital marketing, yet it remains one of the least-adopted channels among small businesses. This study synthesizes primary benchmark data from Litmus, the DMA, Klaviyo, MailerLite, Shopify, Campaign Monitor, and LocaliQ to show what email actually returns, where the real performance gains come from, and why adoption still lags so far behind the numbers.

Methodology

This report was prepared by Make It Loud Digital Marketing as part of its North Atlanta Small Business Research Series. It synthesizes primary benchmark data from major email platforms, including Klaviyo's 2026 analysis of more than 183,000 brands, MailerLite's analysis of 3.6 million campaigns, Campaign Monitor's personalization and automation reports, and GetResponse's analysis of 4.4 billion messages, alongside long-running third-party ROI research from Litmus and the DMA and channel comparison data from Shopify. Small business channel adoption data is drawn from LocaliQ's 2026 Big Small Business Marketing Trends Report. Figures reflect national and cross-platform benchmark averages and are not specific to North Atlanta or Georgia. Open rate figures should be interpreted with caution given Apple Mail Privacy Protection's effect on tracking accuracy since 2021; click rate and click-to-open rate are generally considered more reliable current engagement metrics. This report does not constitute a guarantee of results for any individual business.

Findings

Email marketing returns 36 to 42 dollars for every dollar spent, the highest of any channel measured, a figure that converges independently across Litmus, the DMA, Klaviyo, Mailchimp, and Campaign Monitor rather than one number copied across the internet; retail and ecommerce average closer to 45 dollars, and nearly one in five businesses report an ROI above 70 dollars per dollar, while social media sits around 2.80 dollars, putting email 13 to 15 times higher. The largest performance gap lives inside email itself: automated flows earn 1.94 dollars per recipient versus 0.11 dollars for standard one-time campaigns, a 17.6-times difference, and Klaviyo found automated flows produce about 41% of email revenue from just 5.3% of sends. Email also wins on conversion, not just ROI ratio: Shopify data shows email traffic converts at 4.24% versus 2.49% for organic search and 0.59% for social media. Despite all of this, LocaliQ found only 53% of small businesses use email marketing at all, tied with SEO as the least-adopted major channel and well behind unpaid social media's 66%.

Overview

Every few years a new marketing channel promises to be the future. Email marketing, meanwhile, keeps quietly outperforming all of them on the one metric that matters most to a small business: documented return on investment. This study walks through what the current data shows about email’s performance, why that data is unusually trustworthy compared to some other marketing statistics, where the real gains inside email come from, and why adoption still lags so far behind the return the channel is capable of producing.

Email’s ROI is not close, and it is unusually well documented

The most commonly cited figure for email ROI is 36 dollars returned for every dollar spent, a number that traces back to Litmus’s long-running research and has been independently corroborated by the DMA’s Marketer Email Tracker and multiple 2025 to 2026 benchmark reports, with several sources placing the upper end as high as 42 dollars. For context, the same research family places social media’s average ROI at roughly 2.80 dollars per dollar, meaning email’s documented return runs 13 to 15 times higher. Retail and ecommerce see stronger returns still, closer to 45 dollars, and nearly one in five businesses report an ROI above 70 dollars per dollar. What makes the figure worth trusting is how independently it reproduces: Klaviyo’s data from more than 183,000 brands, Mailchimp’s platform-wide data, GetResponse’s analysis of 4.4 billion messages, and Campaign Monitor all arrive in the same range, rather than one original figure being copied across secondary sources.

Automation is where the real performance gap lives

Not all email performs equally, and the gap between automated and one-time campaigns is enormous. Platform data compiled by Email Monday found automated flows, meaning welcome sequences, abandoned cart reminders, and post-purchase follow-ups, earn an average of 1.94 dollars per recipient versus just 0.11 dollars for standard one-time broadcasts, a roughly 17.6-times difference. Campaign Monitor found automated emails drive 320% more revenue than non-automated emails, and Klaviyo’s 2026 data found automated flows generate about 41% of total email revenue from just 5.3% of total sends. The engagement numbers are just as stark: automated flows average a 5.58% click rate and 2.11% placed-order rate versus 1.69% and 0.16% for standard campaigns. For a small business without the resources to send frequent manual campaigns, this matters enormously, because a handful of well-built automated sequences can outperform a much larger volume of manual sends.

Email beats search and social on conversion, not just ROI ratio

Conversion rate tells a similar story. Shopify’s channel data found email traffic converts to a purchase at 4.24%, compared to 2.49% for organic search and just 0.59% for social media, meaning email drives more conversions on its own than organic search and social media combined. Campaign Monitor found email links are roughly six times more likely to be clicked than an equivalent social media post. Consumer research reinforces the pattern: 59% of consumers say marketing emails influence their purchase decisions, and 52% report having purchased directly as a result of a marketing email or newsletter. A channel that both converts better and returns more per dollar is precisely why email keeps topping ROI research year after year.

Small, specific details move real numbers

The research on specific tactics is unusually precise. Campaign Monitor found emails with a personalized subject line are opened 26% more often than generic ones, and research from WordStream and Campaign Monitor found emails built around a single, clear call to action generate 371% more clicks than emails with multiple competing calls to action. Welcome emails, the first message a new subscriber receives, average an 83.63% open rate, far higher than typical newsletter rates, making the welcome sequence one of the highest-leverage pieces of email content a business can build. One honest caveat: Apple’s Mail Privacy Protection, in effect since 2021 and covering roughly 35% of the market, automatically registers an open for many Apple Mail users regardless of whether they read the message, so open-rate benchmarks published since 2021 should be read with caution, and click rate and click-to-open rate are increasingly treated as more reliable.

The adoption gap: most small businesses underinvest

Despite email’s documented advantage, LocaliQ’s 2026 Big Small Business Marketing Trends Report found only 53% of small businesses actually use email marketing, tied with SEO for the lowest adoption among major channels and well behind unpaid social media’s 66%, even though social’s documented ROI runs at a small fraction of email’s. This is the same channel-versus-return mismatch this research series has documented elsewhere: businesses gravitate toward the channel that feels free and immediate over the one with the strongest, most independently corroborated financial case. For a North Atlanta business auditing its marketing mix, that points to a specific, low-risk opportunity, precisely because so few local competitors are doing it well.

Practical implications

• Start with automation, not manual campaigns, given the roughly 17.6-times revenue-per-recipient gap between automated flows and one-time sends.
• Simplify every email down to one clear action, given the documented 371% click increase from a single call to action.
• Treat email as infrastructure, not a periodic campaign, because its ROI consistently outpaces every other channel measured.
• Measure click rate and click-to-open rate, not just open rate, given Apple Mail Privacy Protection’s effect on open-rate accuracy since 2021.

These findings connect to our SEO and Social Media Advertising services. For practical next steps, see Ways to Improve Your Email Open Rates and Can Email Marketing Help Your SEO.