Email marketing remains one of the most profitable channels in e-commerce, yet a growing number of brands are discovering that inbox placement can determine whether those messages generate revenue at all.
Inbox placement has become one of the most influential factors in email performance as mailbox providers introduce stricter filtering systems and algorithmic sorting that determines where messages appear. If a campaign lands in Gmail's Promotions tab instead of the primary inbox, the chances of a customer opening and engaging with that message drop significantly.
Industry benchmarks confirm the scale of the opportunity. Email marketing generates an average return on investment of $36 for every $1 spent, making it one of the highest-performing channels in online retailers' marketing.
Mailmend, a technology company focused on improving email deliverability for e-commerce brands using Klaviyo, believes this problem represents one of the largest untapped growth opportunities in modern marketing.
Mailmend Identifies Inbox Placement as the Hidden Revenue Bottleneck
For many online retailers, email marketing strategy focuses heavily on writing better campaigns, increasing subscriber lists, or improving segmentation. Deliverability rarely receives the same level of attention, even though it directly influences whether customers see the message at all.
"Most online retailers think the problem is email content or list size," a Mailmend spokesperson explained. "In reality, the bigger issue is that customers simply never see the emails because they land in the Promotions tab."
The scale of this issue is larger than many brands realize. Google automatically categorizes incoming emails into Primary, Promotions, Social, and Updates tabs using machine learning systems that evaluate message structure, sending patterns, and engagement signals. Messages that land in the Promotions tab often compete with dozens of marketing emails, dramatically reducing visibility.
According to Klaviyo's benchmark data, analyzing more than 325 billion emails, automated flows account for over 40% of total email revenue despite representing only about 5% of sends, demonstrating how valuable timely, visible email communication can be. If these messages fail to reach the right inbox placement, their revenue potential declines significantly.
Mailmend's Technology Was Built Around a Real E-Commerce Problem
The company's origins date back to late 2022, when its founder experienced the deliverability problem firsthand while running a previous coaching business. Marketing campaigns were performing well in testing environments, yet sales results told a different story.
"We realized that the Promotions tab was acting like a hidden spam folder for e-commerce marketing," the founder explained. "Once we fixed the inbox placement issue, revenue increased dramatically without changing the actual campaigns."
That discovery prompted the founder to shut down other projects and invest in a dedicated technology solution designed specifically for online retailers using Klaviyo. The goal was not to create another email marketing tool that writes campaigns or manages lists. Instead, the company focused on the underlying deliverability layer that determines inbox placement.
Mailmend developed an algorithm that analyzes email structure, formatting signals, and sending behavior to help reframe campaigns so mailbox providers categorize them differently. By adjusting these signals, online retailers can significantly improve the likelihood that emails land in the primary inbox.
"Most tools focus on sending more emails," the Mailmend team noted. "Our focus is making sure customers actually see the emails that brands already send."
Mailmend Works with High-Growth Online Retailers
The technology quickly gained traction among e-commerce companies that rely heavily on email-driven revenue. Mailmend has worked with several recognizable brands, including Dr. Squatch, Dossier, StickerYou, BYLT Basics, ORLY, NYDJ, Tracksmith, and Good Ranchers.
Mailmend reports that online retailer companies frequently see 50% to 100% increases in email-driven revenue once inbox placement improves. Although performance varies depending on list quality and campaign strategy, the company argues that the impact often surprises marketing teams.
"Email marketing already works extremely well for e-commerce," the company explained. "When inbox placement improves, brands suddenly unlock revenue that was already sitting in their existing campaigns."
The credibility of Mailmend's approach also comes from its ability to withstand constant changes in email filtering systems. According to the company, its technology has remained effective through more than 48 Google algorithm updates, which frequently change how inbox categorization works.
Mailmend Sees Deliverability as the Next Frontier of E-Commerce Marketing
As e-commerce marketing becomes more competitive, brands are searching for growth opportunities beyond traditional tactics such as increasing ad spend or expanding subscriber lists. Mailmend believes deliverability will become a central focus of that strategy.
"If customers do not see your emails, every dollar spent on email marketing software, copywriting, and campaign design becomes less effective," the Mailmend team explained. "Improving inbox placement changes the economics of the entire email channel."
The company plans to expand its product suite in the coming years, with three to five new AI-powered tools focused on e-commerce performance currently under development. These products aim to address additional challenges in customer communication, automation, and marketing efficiency.
Mailmend believes solving that challenge will define the next phase of online retailers' marketing growth. As inbox filtering systems continue to evolve, companies that prioritize deliverability may gain a significant advantage in a channel that already generates billions of dollars in online sales each year.
About Mailmend
Mailmend is a technology company that helps e-commerce brands improve email deliverability by ensuring marketing campaigns land in the primary inbox instead of Gmail's Promotions tab.
Built for brands using Klaviyo, Mailmend's technology focuses on increasing email visibility so companies can maximize the revenue generated by their existing email marketing programs.
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