Email Delivers Strong ROI—But Proving It Remains a Challenge

Email continues to be one of the most effective marketing channels, yet many organizations still struggle to clearly demonstrate its return on investment. According to the latest Email Impact Report from Sinch Mailgun, 78% of respondents consider email “very” or “extremely” important to their organization’s success—reinforcing its role as a core business driver.

However, that importance is not matched by measurement clarity. Only 46% of marketers say they can quantify the ROI of promotional emails, while 43% report being able to measure transactional email ROI. This leaves email in a paradoxical position: essential to performance, yet difficult to fully validate in financial terms.

Strong Returns—Where Measurement Exists

For organizations that can measure ROI, the results are compelling. Among marketers tracking promotional email performance, 60% report generating more than $10 in return for every $1 spent. Transactional email performs similarly—if not better—with 62% of respondents reporting returns above that same threshold.

A smaller segment reports even higher performance, with 13–14% of marketers indicating returns exceeding $40 for every dollar invested. These figures highlight email’s potential as a high-performing channel—provided the right measurement frameworks are in place.

The Attribution Gap

The disparity in measurability is partly driven by the nature of different email types. Transactional emails—such as order confirmations, password resets, fraud alerts, and shipping updates—are directly tied to user actions, making them easier to link to outcomes and revenue.

Promotional emails, by contrast, often operate across longer customer journeys and multiple touchpoints. Their influence may be significant, but it is harder to isolate, making attribution more complex and less precise.

Performance Without Proof

This complexity creates a familiar challenge for marketing teams. When attribution is unclear, organizations tend to rely on easily accessible metrics rather than comprehensive ROI analysis. As a result, email’s true impact is often underrepresented.

The data suggests a clear conclusion: email marketing is delivering strong returns, but inconsistent measurement frameworks are limiting visibility. For organizations seeking to justify increased investment, improving attribution and ROI tracking will be critical to unlocking the channel’s full strategic value.