Email does a lot more work than it usually gets credit for. In Sinch Mailgun’s latest Email Impact Report, 78% of respondents say email is either “very” or “extremely” important to their organization’s success, which tells you pretty quickly that this is still a core business channel.

The problem is that importance and measurability are not lining up. Only 46% of marketers say they can measure the ROI of promotional email, while 43% say they can measure the ROI of transactional email.

So email sits in an odd spot for a lot of teams. It is clearly essential, but its contribution is still harder to quantify than many marketers would like.

Source: Sinch Mailgun Email Impact Report

ROI is there, but visibility is uneven

Once you look at the marketers who can measure ROI, the returns get hard to ignore. Among respondents who measure promotional email ROI, 60% say it delivers more than $10 for every $1 spent.

Source: Sinch Mailgun Email Impact Report

Transactional email looks just as strong, and in some cases, a little stronger. Of the marketers who measure transactional email ROI, 62% report returns greater than $10 for every $1 spent.

Source: Sinch Mailgun Email Impact Report

There is also a smaller group reporting especially high returns. Thirteen percent of respondents measuring promotional email ROI and 14% measuring transactional email ROI say they generate more than $40 for every dollar spent.

That creates a familiar martech tension. The channel appears to perform very well for teams with the right measurement in place, while everyone else is left trying to fill in the blanks.

Transactional email has an easier case to make

Part of that gap comes from the nature of the messages themselves. Transactional emails include things like order confirmations, fraud alerts, password resets and shipping updates, so they are usually tied to specific customer actions and are easier to connect to outcomes.

Promotional email is a little more complicated. It often works across longer buying cycles and multiple touchpoints, making attribution harder even when the emails are clearly influencing engagement or conversions.

That complexity shapes how teams evaluate performance. When attribution gets messy, marketers tend to fall back on the metrics that are easiest to access and explain.

That is one reason ROI can remain fuzzy even in organizations that depend heavily on email. The performance may be there, but the proof is often incomplete.

Marketers still lean on easier metrics

The report shows that many teams are still using engagement measures as their primary guide. Click rates, delivery rates and deliverability metrics remain common ways to judge email performance, even though they do not always show direct business impact.

The real problem is that revenue-based measurements are less common. Fewer organizations are tracking metrics like total email channel revenue or revenue per campaign, making it harder to connect email activity to financial outcomes.

That makes it harder when marketers try to argue for more resources. The report identifies budget constraints as the biggest barrier to investing in email, while proving ROI, prioritizing email and dealing with strategy or integration issues also hold teams back.

Taken together, the findings describe a channel that is still central to business success and often highly profitable, but not measured well enough for many teams to defend it as aggressively as they probably should.

Source: Sinch Mailgun Email Impact Report. (No registration required)

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