Email Deliverability Statistics: 14 Data Points for 2026

Inbox placement, spam rates, and sender requirements, sourced from EmailToolTester's provider tests, Kaspersky's spam telemetry, and the official Google and Yahoo sender rules, with every number checked against the cited source page.

Data verified August 7, 2026 · Next review November 7, 2026

Key takeaways

The average deliverability rate across 15 tested email providers is 83.1%, meaning 16.9% of emails never reach the inbox.
On average 10.5% of emails land in spam and another 6.4% go missing entirely.
Spam accounted for 44.99% of all email sent worldwide in 2025, and Gmail's filters stop more than 99.9% of spam, phishing, and malware.
Google and Yahoo both cap bulk sender spam rates at 0.3%, and Google recommends staying below 0.10%.
The average cold email bounce rate is 5.1%; keeping it below 2% is the accepted target.

How much email reaches the inbox

EmailToolTester runs recurring deliverability tests across major email service providers, and the results set the baseline for what senders should expect.

1
The average email deliverability rate across the 15 email service providers tested by EmailToolTester was 83.1%, which means 16.9% of emails never reach the intended recipient's inbox.
Source: EmailToolTester (2026)
2
On average, 10.5% of emails end up in the intended recipient's spam folder.
Source: EmailToolTester (2026)
3
6.4% of emails go missing altogether and are considered undelivered.
Source: EmailToolTester (2026)
4
A deliverability rate above 89% is considered good, above 95% is considered excellent, and below 80% is considered poor.
Source: EmailToolTester (2026)
5
Sopro puts ideal deliverability for prospecting campaigns at 95% to 98%.
Source: Sopro (2026)

Spam volume and filtering

Mailbox providers filter aggressively because spam still makes up nearly half of all email traffic.

6
Spam accounted for 44.99% of all email sent worldwide in 2025.
Source: Kaspersky Securelist (2026)
7
Gmail's AI-powered defenses stop more than 99.9% of spam, phishing, and malware from reaching inboxes.
Source: Google (2023)
8
After Google began requiring email authentication, the number of unauthenticated messages Gmail users received dropped by 75%.
Source: Google (2023)

Google and Yahoo sender requirements

The bulk sender rules that took effect in February 2024 turned informal deliverability standards into hard requirements with published thresholds.

9
Google requires senders of 5,000 or more daily messages to Gmail accounts to authenticate email with SPF, DKIM, and DMARC.
Source: Google (2024)
10
Google recommends keeping spam rates reported in Postmaster Tools below 0.10% and avoiding ever reaching 0.30% or higher.
Source: Google (2024)
11
Yahoo requires bulk senders to keep spam complaint rates below 0.3% and to publish a DMARC policy of at least p=none.
Source: Yahoo (2024)
12
Yahoo requires a functioning one-click unsubscribe header on marketing messages and expects unsubscribe requests to be honored within 2 days.
Source: Yahoo (2024)

Bounce rate benchmarks

Bounce rate is the deliverability metric senders control most directly, since it tracks list quality more than content.

13
The average cold email bounce rate is 5.1%, with below 2% considered good and below 1.5% excellent.
Source: Woodpecker (2025)
14
48% of cold email senders report bounce rates between 2% and 5%, while 15% report bounce rates above 6%, according to Mailshake data compiled by HubSpot.
Source: HubSpot (2025)

How to cite this page

APA: Best Cold Outreach Tools. (2026). Email Deliverability Statistics 2026: Spam & Inbox Placement. Retrieved from https://bestcoldoutreachtools.com/statistics/email-deliverability-statistics
MLA: "Email Deliverability Statistics 2026: Spam & Inbox Placement." Best Cold Outreach Tools, 2026, https://bestcoldoutreachtools.com/statistics/email-deliverability-statistics.
Chicago: Best Cold Outreach Tools. "Email Deliverability Statistics 2026: Spam & Inbox Placement." Accessed August 7, 2026. https://bestcoldoutreachtools.com/statistics/email-deliverability-statistics.

Frequently asked questions

›What is the average email deliverability rate?

EmailToolTester's tests across 15 email service providers found an average deliverability rate of 83.1%, with 10.5% of emails landing in spam and 6.4% going missing. Above 89% is considered good and above 95% excellent.

›What spam rate do Google and Yahoo allow?

Both cap bulk senders at a 0.3% spam rate. Google recommends staying below 0.10% in Postmaster Tools and never reaching 0.30% or higher.

›What are the Google bulk sender requirements?

Senders of 5,000 or more daily messages to Gmail must authenticate with SPF, DKIM, and DMARC, keep spam rates below 0.3%, and support one-click unsubscribe. Yahoo applies matching rules and expects unsubscribes honored within 2 days.

›What is an acceptable bounce rate for cold email?

Woodpecker's benchmark puts the average at 5.1%, with below 2% considered good and below 1.5% excellent. Per Mailshake data compiled by HubSpot, 48% of cold email senders sit between 2% and 5%.