What most marketers miss about email ROI

Email marketing maintains a strong reputation

Email marketing continues to attract attention because of its supposed high return on investment. Claims of a 40x ROI have been repeated across the digital marketing world, but as the Mailgun survey shows, this figure is not the norm. It requires optimal conditions, accurate data collection, and consistent measurement practices, factors many organizations cannot guarantee. The survey, based on responses from about 1,200 email senders, found that 78% of businesses consider email crucial to their operations. Yet fewer than half can accurately measure their own ROI, and only 13% of those campaigns reached the high $40-per-$1 return often used as a benchmark.

This lack of clarity matters. If a leadership team believes they are operating at peak efficiency while their measurement process is incomplete, they are making decisions based on assumptions rather than evidence. Without reliable data, budgets are often misallocated, and true performance remains hidden. The upside is that the potential is real, where companies approach ROI measurement with discipline and data integrity, email marketing can serve as one of the highest-yield tools in modern marketing.

For decision-makers, the lesson is straightforward: confidence in performance metrics is about data consistency and reality-based evaluation. Getting the numbers right reveals untapped efficiency across the organization. When leaders understand what’s really working, they can direct investment toward what truly scales.

Measuring ROI is vital for enhancing campaign success

ROI measurement is the difference between intuition and control. The Mailgun report makes clear that companies who actively measure their email performance are better equipped to adapt and improve their campaigns. Yet it also shows why many struggle to do it effectively. Different attribution models, first-click, last-click, linear, position-based, or time-decay, tell different stories about the same customer journey. Each assigns value differently, and that creates multiple “truths” within one dataset.

This complexity deepens when considering that most email management platforms operate as closed systems. They show performance metrics, but rarely reveal how those metrics are calculated. For leadership, this should raise a concern: if measurement tools cannot clearly define how success is determined, strategy decisions risk being based on partial or misleading data. To improve accuracy, investing in transparent and unified analytics systems is non-negotiable. These tools connect customer engagement, cost, and conversion data across the organization, producing a more cohesive and trustworthy picture of ROI.

C-suite executives should view this as a long-term operational upgrade. Consistent measurement frameworks enable informed decision-making, accurate forecasting, and more efficient capital deployment. When you can trace ROI through precise, cross-channel attribution, marketing becomes not just a cost center, but a measurable driver of growth and strategic direction.

Differentiating between promotional and transactional emails is essential

Not all emails are created to achieve the same outcome. Promotional emails aim for measurable conversions, clicks, sign-ups, and direct sales. Transactional emails, on the other hand, fulfill operational and customer experience purposes. They include messages like order confirmations, billing notices, and password resets. They build reliability and reduce resource strain on customer service, even if their impact is not immediately visible in direct revenue figures.

The Mailgun report emphasizes that while promotional emails are relatively simple to evaluate, transactional emails create value in indirect forms, such as reducing support requests or customer churn. Executives should recognize that ROI for these communications extends beyond the standard financial models. A confirmation email that decreases inbound support tickets produces cost savings that enhance operational efficiency, even if it does not generate revenue.

Business leaders need to consider both categories as part of an integrated communication system. A narrow focus on sales-driven data can undervalue transactional interactions that strengthen long-term customer trust. When organizations align their measurement frameworks to reflect both visible and indirect benefits, they gain a complete view of performance and can optimize resources across the customer journey. Precision in defining goals and metrics for each email type is what separates average marketing execution from strategic oversight.

Inconsistent definitions of “cost” in ROI calculations

ROI is only as accurate as the cost data that supports it. The Mailgun findings show that many companies use different standards when defining what counts as “cost.” Some include only software and infrastructure, while others account for data management, compliance, creative development, and labor. The gap is significant, only about one in five respondents included labor costs in their ROI calculations. This inconsistency can make identical campaign performances appear dramatically different between organizations.

This variability creates a challenge for executives comparing performance across departments or business units. If cost models are inconsistent, the ROI figure cannot serve as a true indicator of efficiency or competitiveness. Decisions based on incomparable measurements risk distorting resource allocation and future planning.

For leaders, the objective should be clear: standardize cost measurement. Establishing a unified definition ensures ROI can be compared across campaigns, quarters, or divisions with confidence. Once costs are consistently captured, leadership gains an honest view of performance and can identify where marginal investments deliver exponential returns. Reliable accounting is not just about accuracy, it’s about enabling growth through better strategic clarity.

Reliance on basic performance metrics limits understanding of the full financial impact of email campaigns

Most marketing teams still rely on fundamental indicators such as open rates and click rates to measure email success. These figures provide some insight into engagement but give an incomplete view of financial performance. The Mailgun report shows that more advanced indicators, such as revenue per campaign, revenue per email, and total channel revenue, are rarely used. In fact, only 12% of email-sending teams base their performance evaluation on ROI.

This reliance on surface-level data results in strategic blind spots. When organizations track only immediate user actions without connecting them to final business outcomes, they risk misunderstanding which campaigns truly drive revenue. Executives cannot rely on engagement metrics alone to guide investment or verify effectiveness. A comprehensive understanding of performance comes from integrating marketing analytics with financial systems, allowing for accurate attribution of value across the sales funnel.

For leadership teams, expanding measurement frameworks to cover both engagement and direct revenue outcomes is not simply an optimization task, it is a necessity for scaling intelligent growth. Decision-makers should push teams to integrate deeper data sources that connect campaign activity with profit contribution. Transparent, revenue-based reporting transforms email marketing from an activity tracker into a measurable growth engine.

Organizational challenges and competing priorities hinder accurate measurement and improvement

Even when the technology exists, internal dynamics often prevent organizations from achieving accurate ROI measurement. The Mailgun survey highlights that inadequate budgets, competing marketing priorities, and lack of executive buy-in remain persistent barriers. While email is widely recognized as a critical channel, investments needed for detailed measurement and analytics are commonly deprioritized. Without this commitment, teams operate with partial insights, limiting their ability to improve campaign performance or demonstrate value.

For executives, the real issue is operational alignment. Accurate ROI measurement requires data integration across departments, marketing, sales, finance, and customer service. It is not a technical barrier; it is an organizational one. When teams operate independently, marketing data remains isolated, weakening strategic visibility. Coordinating data across units creates a unified performance view, enabling faster, evidence-based decisions.

Leaders who commit to cross-functional data strategies gain more than accurate reporting, they gain control over outcomes. Comprehensive analytics show where email drives real returns and where inefficiencies exist. Establishing system-wide collaboration around data not only improves ROI accuracy but also enhances the organization’s ability to grow with intention and focus.

Main highlights

• Email ROI is often overstated: While email remains a powerful marketing channel, reported 40x returns are rarely achieved. Leaders should focus on improving measurement accuracy before assuming high-performance claims.
• Measurement defines success: ROI tracking is essential but frequently unreliable due to inconsistent attribution models. Executives should invest in transparent analytics that unify data across platforms to enable precise campaign evaluation.
• Promotional and transactional emails require distinct metrics: Promotional messages tie to sales, while transactional emails deliver indirect value such as cost savings and customer retention. Leaders should ensure both types are measured with tailored success criteria.
• Standardizing cost definitions improves ROI clarity: Disparate cost accounting, particularly excluding labor, distorts ROI comparisons. Executives should enforce consistent cost frameworks across teams to ensure comparability and truth in performance reporting.
• Basic engagement metrics limit strategic insight: Heavy focus on open and click rates masks true financial impact. Leaders should expand reporting to include revenue-based metrics for a genuine picture of email performance and profitability.
• Organizational alignment drives measurement precision: Competing priorities and weak executive buy-in hinder accurate ROI analysis. Leadership should champion cross-departmental data integration to create unified, actionable performance insights.