40+ Email Deliverability Statistics for 2026

How this list is different

Deliverability is the one email metric nobody can self-report honestly: your sending tool says "delivered" while the message sits in a spam folder nobody opens. So the numbers that matter come from seed-list testing and mailbox-provider data, not from campaign dashboards.

Every figure below traces to a named primary source: Validity's Email Deliverability Benchmark (the largest seed-based dataset published), EmailTooltester's independent provider tests, and Google's own published sender requirements. Each carries its dataset and year, and pre-2022 material is flagged.

Key deliverability statistics at a glance

• Global inbox placement was 83.5% in 2024, meaning roughly one in six legitimate marketing emails never reached the inbox (Validity)
• Spam placement almost doubled across 2024, from 4.5% in Q1 to 8.6% in Q4 (Validity)
• Microsoft is the toughest major provider at 75.6% inbox placement versus Gmail's 87.2% (Validity)
• Only 25% of senders report spam complaint rates in the best-practice band below 0.1% (Validity)
• Google requires bulk senders to stay below 0.30% spam complaints, recommending below 0.10% (Google)
• Independent testing found average deliverability of 83.1% across email service providers (EmailTooltester)

Global inbox placement statistics

• Global inbox placement rate was 83.5% in 2024, with 6.7% landing in spam and 9.8% missing entirely (Validity Email Deliverability Benchmark, 2025 report)
• That is a decline from the prior edition's 84.8% inbox, 6.1% spam, 9.1% missing (Validity)
• Spam placement almost doubled through 2024, from 4.5% in Q1 to 8.6% in Q4 (Validity)
• During the Q4 peak sales season, inbox placement dipped to 82.3%, the year's low point (Validity)
• Global inbox placement peaked at 87.2% in 2025 before trending down to 84.5% in Q2 2026 (Validity 2026 benchmark data, published on Validity's blog)
• At roughly 87% global placement, about one in eight permission-based marketing emails never reaches the inbox; the UK average sits near 91% but has fallen more than two points as providers tighten bulk-sender enforcement (DMA UK Email Benchmarking Report, sponsored by Validity, 2026)

Deliverability by mailbox provider

The single most actionable dataset in deliverability: placement is not uniform, and Microsoft is consistently the hard one.

All figures: Validity Email Deliverability Benchmark, 2024 data.

• Validity's verdict is explicit: with 75.6% inbox placement, Microsoft is the toughest mailbox provider for deliverability (Validity)
• Gmail inbox placement averaged 89.8% across 2024 but declined to 84.2% by Q4, a drop of nearly five points (Validity)
• Gmail has roughly 2.5 billion users and accounts for nearly one in two consumer mailboxes globally, which is why Gmail policy changes move the whole market (Validity)

Independent provider testing

• Average deliverability across all tested email service providers was 83.1%, meaning 16.9% of emails went missing or to spam (EmailTooltester, January 2024 test round)
• Best performer that round: ActiveCampaign at 94.2%; best five-round average: MailerLite at 94.41%; worst performer scored 47.1% (EmailTooltester, 2024)
• Provider spread within the same test: most ESPs hit 94-100% to Gmail, while results to Microsoft ranged from 9.3% to 100% (EmailTooltester, 2024)
• EmailTooltester's own grading scale: above 89% is excellent, below 83% is poor (EmailTooltester, 2024)

Spam complaints and sender requirements

These are not benchmarks; they are the published rules that decide whether your mail is accepted at all.

• Google requires bulk senders (5,000+ messages/day to Gmail) to keep spam rates in Postmaster Tools below 0.30%, and recommends below 0.10% (Google Email Sender Guidelines)
• Google mandates SPF, DKIM, and DMARC authentication for bulk senders (Google)
• Marketing messages must support one-click unsubscribe with a clearly visible link (Google)
• Against that bar, only 25% of senders surveyed report average complaint rates in the best-practice band below 0.1% (Validity, 2025)
• Validity's assessment of why this matters: spam complaints are the single biggest factor degrading sender reputation (Validity)

What the verified numbers actually mean

Read together, the deliverability data describes a tightening market. Inbox placement is drifting down year over year, spam placement nearly doubled inside a single year, and the two largest providers moved from guidance to enforceable requirements. The gap between "sent" and "seen" is now roughly one email in six, and it widens exactly when volume peaks.

The practical implications are unglamorous and consistent: authenticate properly, keep complaints an order of magnitude below the 0.30% ceiling, verify lists before sending (see list hygiene), warm domains before scaling (email warmup), and test placement rather than trusting delivery reports. For senders on Microsoft-heavy B2B lists, assume the harder number: three in four, not nine in ten.

Related benchmarks: cold email statistics covers reply and open performance, and sender reputation explains the scoring behind these placement rates.

Why placement varies so much between senders

The global averages on this page conceal a distribution, and knowing its shape matters more than knowing the mean.

Reputation is per domain, not per industry. Two companies sending identical content from identical platforms can see a thirty-point placement gap, because reputation is built on their own complaint history, engagement and sending pattern. There is no industry benchmark that overrides your own record.

Providers weigh signals differently. Microsoft leans harder on sender reputation and historical patterns, which is why it is consistently the toughest. Gmail weighs recipient engagement more heavily, so a list with genuine openers performs better there than raw volume would predict.

Volume changes are treated as risk. Going from 200 emails a day to 2,000 is interpreted as a new sender regardless of your history, which is why ramping matters as much as content does.

The practical consequence is that these figures are useful for setting expectations and useless for diagnosis. If your placement is below them, the answer is in your own authentication, complaint rate and sending pattern, not in the benchmark.

The takeaway

Deliverability data in one sentence: roughly one in six legitimate emails misses the inbox, the number is getting worse, and the rules are now published and enforced. The senders who stay in the inbox are not lucky, they authenticate, they keep lists clean, they pace volume, and they measure placement instead of delivery.

What to fix first

The order matters: authentication, then complaint rate, then content.

Only a quarter of senders keep complaints inside the band Google recommends, and that single number predicts more placement outcomes than anything else here. Fix it before touching subject lines. The tool comparison covers what monitors what, and warm-up tools cover domain history.

Once mail is landing, relevance decides the rest: reply benchmarks show personalization roughly doubling responses. Outsales writes each message for the person receiving it and sends from your own mailbox, which is the setup providers reward.

The requirements themselves are published: Google's sender guidelines set the 0.30% ceiling referenced above. For the practical side, see warm-up tools and cold email benchmarks.

For what to do once placement is healthy, see how many follow-up emails is too many and cold email software.