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San Francisco, CA – April 17, 2026 – The landscape of digital communication continues to evolve, yet email steadfastly retains its position as a cornerstone of organizational engagement. A groundbreaking new study, the Mailgun 2026 Email Impact Report, underscores this enduring relevance while simultaneously revealing a growing chasm between email programs that actively invest in sophisticated measurement, deliverability, and optimization strategies, and those that operate on outdated assumptions. This comprehensive report, published today, draws from an extensive global survey of over 1,200 email senders and a meticulous analysis of more than 400 billion real emails processed through Mailgun’s infrastructure in 2025, offering an unparalleled look into the state and future trajectory of email marketing.
The report, spanning five critical chapters covering Return on Investment (ROI), industry benchmarks, deliverability, artificial intelligence (AI) adoption, and investment trends, presents crucial insights for email senders navigating the increasingly complex digital environment heading into the second half of 2026. Its findings suggest that while email remains indispensable, its true potential is only being unlocked by a segment of organizations willing to embrace data-driven practices and advanced technological integration.
Email’s Undeniable Value Meets a Measurement Deficit
The Mailgun report unequivocally confirms email’s strategic importance within modern organizations. A striking 78% of surveyed senders categorize email as "very" or "extremely" important to their operations, a level of consensus rarely observed across marketing channels. This widespread organizational belief in email’s power, however, frequently outpaces the tangible evidence supporting its impact. Fewer than half of senders actively measure the ROI of their email programs, with promotional email ROI tracked by only 46% and transactional email ROI by 43%. This significant measurement deficit means that a majority of teams are operating on conviction rather than concrete data, potentially leaving substantial value on the table and hindering strategic investment.
For those organizations that do meticulously track their email ROI, the financial returns are compelling. The report highlights that 60% of senders monitoring promotional email ROI report a return greater than $10 for every $1 spent. Similarly, 62% achieve the same impressive returns for transactional emails. A notable 13% even report returns exceeding $40 for every dollar invested. Interestingly, Mailgun’s research suggests that such extraordinarily high ROI figures might, in some cases, signal underinvestment in the email program rather than peak efficiency. This paradoxical finding implies that businesses could potentially achieve even greater overall gains by scaling their email efforts, provided they are supported by robust measurement frameworks.
The primary obstacle to increasing email investment, cited by 43% of senders, is budget constraints. This perpetuates a challenging cycle: budget allocation is difficult to secure without compelling data, yet most teams lack the necessary data to build a persuasive case. The report advocates for an incremental approach, recommending that organizations begin by tracking revenue per campaign as an intermediate step toward full ROI tracking. This pragmatic advice acknowledges that perfect attribution models are often elusive at the outset, but emphasizes that even imperfect data is superior to none when seeking to justify further investment and demonstrate value. Industry analysts frequently echo this sentiment, stressing that basic metrics, when consistently applied, can lay the groundwork for more sophisticated attribution over time.
Real-World Benchmarks from 400 Billion Emails
Historically, industry benchmark data has largely relied on surveys and self-reported estimates, which can be prone to inaccuracies or biases. Chapter 2 of the Mailgun report distinguishes itself by adopting a more empirical methodology, presenting real sending data derived from Mailgun’s infrastructure across the top 10 industries by volume in 2025. This unprecedented analysis of 400 billion emails provides a more accurate and granular understanding of where performance benchmarks genuinely lie.
The data reveals significant performance disparities across sectors. The Air Freight & Logistics industry leads with an impressive 99.25% delivery rate and a remarkably low 0.01% bounce rate. This exceptional performance is largely attributed to the nature of their email communications, which are predominantly transactional (e.g., shipping confirmations, tracking updates) sent to recipients who explicitly expect and desire these messages. Conversely, the Media industry recorded the lowest delivery rate among the top 10, at 95.95%. This lower figure is a natural consequence of high sending volumes and broader promotional audiences, which inherently create downward pressure on delivery metrics due to factors like varying engagement levels and higher spam complaint rates.
However, the report critically cautions against relying solely on delivery rate as a performance indicator. An email "delivered" to a recipient’s spam folder still technically counts as delivered by the server. To gain a true understanding of email effectiveness, the report strongly advocates for senders to pair delivery rate tracking with consistent inbox placement testing. This crucial practice allows organizations to ascertain where their emails are actually landing—whether in the primary inbox, promotions tab, or spam folder—rather than merely confirming server acceptance. The distinction is paramount for maximizing engagement and ROI.
Further insights emerge from unsubscribe data. The Information Technology sector registered the highest raw number of unsubscribes, at 261 million. However, when contextualized against its colossal send volume of 172.9 billion emails, this translates to a relatively low unsubscribe rate of approximately 0.15%. In contrast, the Retail industry generated 37.4 million unsubscribes from a significantly smaller volume of 8.08 billion sends, indicating a substantially higher unsubscribe rate per email. This comparison underscores a critical analytical point: raw unsubscribe volume, without the corresponding send volume context, is statistically meaningless and can lead to misinterpretations of audience health and content relevance.
Deliverability Advances Amidst Persistent Knowledge Gaps
Email deliverability remains a critical concern for organizations, with 89% of senders acknowledging its importance. The report provides encouraging data on infrastructure improvements, noting that 43% of senders observed an improvement in their inbox placement over the past 12 months. This progress is largely attributable to the accelerated adoption of robust email authentication protocols. DMARC (Domain-based Message Authentication, Reporting, and Conformance) adoption, for instance, has surged from 43% in 2023 to 61% in 2025. This rapid increase has been heavily influenced by stricter requirements imposed by major email service providers (ESPs) such as Gmail, Yahoo, and Microsoft, which have mandated stronger authentication for bulk senders to combat spam and phishing.
For the first time in Mailgun’s research, the report indicates that DMARC enforcement is now outpacing passive monitoring, with over half of DMARC adopters utilizing quarantine or reject policies. This shift signifies a maturation of email security practices, as organizations move beyond merely monitoring potential issues to actively preventing unauthorized use of their domains.
Despite these significant advancements in infrastructure and security protocols, a substantial knowledge gap persists among senders. A concerning 36% of senders claim to monitor their "email deliverability rate," a metric that, as the report clarifies, does not accurately exist. The delivery rate solely measures whether an email was accepted by the receiving server, regardless of its final destination (inbox or spam). Inbox placement, on the other hand, provides the true measure of whether an email successfully reached the recipient’s primary inbox. Only 25% of senders consistently conduct inbox placement tests to ascertain this crucial distinction. Furthermore, 27% of DMARC users remain unaware of the specific policy (none, quarantine, or reject) they have implemented for their domain. This disparity highlights a critical challenge: while the tools and technologies for improved deliverability are advancing rapidly, the literacy and strategic understanding required to leverage them effectively are not keeping pace, leading to missed opportunities and ongoing deliverability struggles for many.
AI Adoption: Widespread Interest, Uneven Impact
The integration of artificial intelligence into email programs is becoming ubiquitous, with 79% of senders currently using or planning to use AI in their email initiatives. However, the report reveals that actual regular use stands at a modest 27%, indicating that a significant portion of adopters are still in the experimental phase rather than systematically embedding AI into their daily workflows.
The most prevalent application of AI is for copy generation, cited by 41% of senders. This is followed by content personalization (36%), dynamic content creation (29%), send time optimization (27%), and data analysis (27%). The emerging pattern suggests that AI delivers the most substantial value when it is deeply integrated into strategic decision-making processes, rather than being confined to mere content production. Teams that are leveraging AI for sophisticated personalization, optimizing send times, and conducting advanced A/B testing report compounding returns, signifying a more profound impact on overall program performance. In contrast, teams utilizing AI predominantly for rudimentary tasks like drafting subject lines are experiencing limited, if any, discernible impact.
A headline finding from the report underscores AI’s transformative potential: 54% of senders actively using AI reported an improvement in their email programs in 2025, compared to only 37% of non-AI users. This significant 17-point gap serves as the clearest indicator yet that AI is beginning to stratify email programs into distinct performance tiers. While the report carefully notes that this finding does not definitively prove causation, the consistent direction of the data strongly suggests a correlation between AI adoption and enhanced email program efficacy. It also highlights that 23% of AI users reported no benefit, emphasizing that the tool itself is not the sole determinant of success; rather, the depth and strategic nature of its integration are paramount. Industry observers suggest that organizations treating AI as a tactical add-on will fall behind those who view it as a strategic imperative for optimization and competitive advantage.
Future Investment Trends: A Focus on Data, Deliverability, and Optimization
Looking ahead to 2026, the Mailgun report indicates a positive outlook for email investment, with 31% of organizations planning to increase their spending on email programs, while 48% intend to maintain their current investment levels. The top strategic priorities for email senders are tied: "taking advantage of AI" and "increasing email engagement," each cited by 40% of respondents. This dual focus reflects a recognition that technological advancement and audience connection are symbiotic for future success.
The report’s concluding analysis delivers a straightforward message: email unequivocally works. The comprehensive data presented across ROI metrics, real-world benchmarks, and deliverability trends consistently supports this assertion. However, the critical differentiator for programs poised to achieve superior performance will be simultaneous investment in three interconnected areas:
- Measurement: Proving ROI with verifiable, real-world data, moving beyond assumptions to data-driven justification.
- Deliverability: Consistently ensuring emails reach the inbox through diligent authentication (DMARC, SPF, DKIM), meticulous list hygiene, and continuous monitoring of inbox placement.
- Optimization: Leveraging advanced tools and methodologies, particularly AI and robust A/B testing frameworks, to continuously improve performance at scale.
Crucially, the report emphasizes that none of these strategic imperatives necessitate a massive initial budget. Many foundational steps, such as implementing DMARC or beginning to track basic campaign revenue, can be initiated with relatively modest resources. The true power of these investments, however, lies in their compounding effect over time. Organizations that strategically integrate these three pillars will not only sustain their email performance but also build a significant competitive advantage in an increasingly crowded and sophisticated digital communication landscape. The message is clear: the future of email success belongs to the data-driven, the deliverability-focused, and the AI-empowered.
