Email Marketing Statistics 2026: Research by Refresh List

Email marketing still produces meaningful returns for many organizations. But a number like “$36 for every dollar spent” can conceal more than it explains if we do not ask who was surveyed, what they counted as a return, and which costs they included.

The same caution applies to open rates, delivery rates, inbox placement, and list decay. They are not interchangeable measures. Some describe a campaign, some a provider’s dataset, and some a mailbox provider’s technical response. None alone tells a team whether its audience is reachable, interested, permissioned, and commercially valuable.

We reviewed published research from Litmus, the Data & Marketing Association (DMA), Mailchimp, Validity, and Google’s official sender documentation. This is a synthesis of those sources, not a new survey or an independent campaign experiment.

2026 email marketing statistics at a glance

These rows do not form a single comparable dataset. That is precisely why every statistic below is tied to its source, population, and time period.

Email marketing ROI statistics: strong results, uneven measurement

Litmus’s 2025 State of Email survey, based on responses from nearly 500 marketing professionals worldwide, reports that 35% of respondents receive $10 to $36 for each dollar spent on email marketing, 30% report $36 to $50, and 5% report more than $50. The same research says 21% of marketing leaders do not measure email ROI.

That unmeasured share matters. A reported return can vary according to whether a company counts attributed revenue or incremental revenue, which expenses it includes, and how it handles multi-touch journeys. These figures describe survey responses, not an expected return for every organization.

Our view: the most useful ROI number is the one your own team can explain. Track campaign and list-maintenance costs, define the attribution window, and distinguish revenue associated with email from revenue the campaign actually caused. For planning, compare a campaign’s result with a sensible holdout or other baseline where possible.

Email delivery rate vs inbox placement rate

The DMA’s 2025 Email Benchmarking Report says the overall delivery rate reached 98% in 2024, drawing on anonymized data from seven leading UK email service providers. It reports 99.2% for B2C. In the same report, open rates were 35.9% and unique click rates were 2.3% for the reported benchmark dataset.

Those figures are useful for understanding the DMA’s contributing providers and period. They should not be read as a guarantee that 98% of marketing email reached recipients’ primary inboxes.

Validity defines its inbox placement rate as the percentage of email that reaches the inbox, separate from provider-reported delivery, which tracks acceptance by the recipient’s mail server. In a May 2026 analysis, Validity reported a global IPR of 84.5% for Q2 2026, after reporting an 87.2% high-water mark for the prior year.

The DMA and Validity figures come from different sources, populations, and measurement systems. Do not subtract one from the other to estimate a universal spam rate. The practical lesson is narrower: server acceptance and inbox visibility answer different questions, so a delivery dashboard cannot substitute for inbox placement measurement.

Average email open rate by industry: read the date first

Mailchimp’s public benchmark page lists a 35.63% average open rate and 2.62% average click rate across all users. It lists Business and Finance at 31.35% opens and 2.78% clicks, Nonprofits at 40.04% and 3.27%, Education and Training at 35.64% and 3.02%, and Ecommerce at 29.81% and 1.74%.

Mailchimp says these figures were last updated in December 2023, and explains that its analysis included tracked campaigns sent to at least 1,000 subscribers. That makes this a dated reference point, not a verified average email open rate by industry for 2026. Apple Mail Privacy Protection and other privacy or security behavior can also inflate or otherwise complicate open measurements.

Our view: use opens for cautious trend monitoring within a consistent measurement setup. For decisions about customer interest, prioritize unique clicks, qualified replies, conversions, retention, and revenue per recipient. A high open rate is not proof that people read, understood, or acted on a message.

How quickly do email lists decay?

There is no single defensible annual B2B email list decay rate that applies to every source, market, and definition of “decay.” A newsletter list built from recent opt-ins behaves differently from an old sales prospect database. Employee moves, company changes, domain changes, role changes, and disengagement affect records in different ways.

The DMA’s 2024 report says B2B email delivery rates fell from 96.8% in 2022 to 92.1% in 2023 and points to employee departures as an important factor. That 4.7 percentage-point movement is a reported change in delivery performance. It is not a measurement that 4.7% of every B2B contact list decays each year.

A better approach is to measure your own cohorts: compare observed outcomes by record source, age, acquisition method, and segment. Record when an address was last checked, keep hard bounces distinct from temporary failures, and retain unknown results for review. Then set a recheck cadence based on the risk of each list and how recently it changed, rather than adopting an unsupported universal interval.

How to improve email list quality without confusing it with consent

List quality is not one green score. For operational use, separate at least these states:

• Duplicates: repeated rows that need a transparent merge or retention rule.
• Invalid: evidence indicates an address is malformed or not usable for the relevant check.
• Unknown: the system could not reach a reliable conclusion.
• Suppressed: the address must not receive a particular message because of an unsubscribe, complaint, policy, or internal restriction.
• Consent: the organization has a separate record of the basis and scope for contacting the person.

These are not synonyms. An address can be technically reachable but suppressed. An address can be valid without its owner having agreed to marketing. A duplicate may carry important account or permission context that should not be discarded just because the email string repeats.

Our recommendation is to preserve original rows and CRM identifiers, add assessment evidence as new fields, and create a send-ready view from explicit rules. That makes list changes reviewable and reduces the chance that a technical check silently erases ownership or permission history.

Refresh List supports email list assessment and verification workflows. You can review the email list cleaning workflow and verification methodology. Verification does not prove consent or guarantee deliverability.

Does email verification improve deliverability?

It can help with one part of the problem. Verification may identify certain malformed, disposable, or unreachable addresses before a campaign. That can inform a send decision and help avoid knowingly sending to some risky records.

It does not guarantee inbox placement, repair SPF or DKIM configuration, establish that a person consented, or tell you whether a message is relevant. Catch-all domains and mail servers that limit probing may also leave an outcome uncertain. A trustworthy workflow preserves that uncertainty rather than forcing every result into pass or fail.

For a high-stakes campaign, use verification alongside permission checks, suppression management, gradual sending practices, authentication, complaint monitoring, and actual campaign outcome review. If delivery failures point to sender authentication, investigate the sending setup instead of repeatedly checking addresses.

Gmail bulk sender requirements in 2026

Google’s current sender FAQ says a bulk sender is one that sends close to 5,000 or more messages to personal Gmail accounts within a 24-hour period. Google counts messages from the same primary domain together, including subdomains, and says senders classified as bulk remain classified as such.

Google’s requirements include SPF and DKIM authentication, a DMARC record, and alignment between the visible From domain and SPF or DKIM for direct mail. Marketing and subscribed messages must support one-click unsubscribe and include a visible unsubscribe link in the body. Google recommends keeping user-reported spam below 0.1% and preventing it from reaching 0.3% or higher.

These rules concern sender configuration and recipient experience. They are not a substitute for contact-data quality, and a clean list by itself does not make a sender compliant. Requirements can change, so consult Google’s sender guidelines and sender FAQ before launch.

A practical email marketing measurement framework

This framework is our editorial recommendation, not an industry standard. Its purpose is to stop one attractive headline metric from standing in for several different business questions.

What the evidence says, and what it does not

Email can generate strong reported returns, but survey ROI is not a promise of future performance. Delivery and inbox placement are different outcomes. Public open-rate tables can remain online after their underlying dataset has aged. B2B contact information changes, but a change in delivery rate is not itself a universal list-decay percentage. Verification can inform list decisions, but it cannot replace permission or sender reputation management.

The common thread is measurement discipline. Preserve the date, denominator, population, and definition behind every metric. Keep observed facts separate from your interpretation of them. Keep original data available so that a later result can be understood in context.

At Refresh List, we believe a useful email list is not merely large or marked valid. It is explainable: the team can see where records came from, what was checked, what remains uncertain, and whether it is appropriate to send.

Frequently asked questions