Every number on this page comes from a named, linked source — no estimates, no recycled figures. Use these 38 statistics on email marketing & list hygiene freely with attribution. Last updated: August 13, 2026.

Key takeaways

  • Email marketing generates an average return of $36 for every $1 spent, making it the highest-ROI marketing channel available.
  • The average email open rate across all industries is 39.64%, with a 3.25% click-through rate and an 8.62% click-to-open rate.
  • Marketing databases naturally decay by about 22.5% every year — roughly 2.1% of contacts going stale each month.
  • Segmented email campaigns earn 14.31% higher open rates and 100.95% higher click rates than non-segmented campaigns.

Email Marketing ROI & Market Value

  • Email marketing generates an average return of $36 for every $1 spent, making it the highest-ROI marketing channel available. (Litmus, 2025)
  • Email ROI varies sharply by industry, reaching $53 per $1 spent in travel and hospitality and $45 per $1 in retail and ecommerce. (Omnisend, 2026)
  • 18% of companies achieve an email marketing ROI greater than $70 for every $1 invested. (Barilliance (via Omnisend), 2025)
  • An estimated 376 billion emails are sent and received every day worldwide in 2025, projected to reach 424 billion daily emails by 2026. (Statista, 2025)

Open, Click & Conversion Benchmarks

  • The average email open rate across all industries is 39.64%, with a 3.25% click-through rate and an 8.62% click-to-open rate. (GetResponse Email Marketing Benchmarks, 2024)
  • Analysis of over 3.6 million campaigns found an average open rate of 43.46% and an average click rate of 2.09% in 2025. (MailerLite, 2025)
  • HubSpot pegs the 2025 average email open rate at 42.35%, but notes Apple Mail Privacy Protection inflates opens, making click metrics the more trustworthy KPI. (HubSpot, 2025)
  • Ecommerce campaign emails average a 31% open rate across industries, while the top 10% of senders reach 45.1%. (Klaviyo Email Marketing Benchmarks, 2026)
  • Ecommerce email campaigns average a 1.69% click rate and a 0.16% placed-order rate, with top performers hitting 3.38% and 0.36% respectively. (Klaviyo Email Marketing Benchmarks, 2026)
  • Industry gaps are wide: non-profit emails average a 52.38% open rate while ecommerce emails average just 32.67%. (MailerLite, 2025)

List Growth, Decay & Churn

  • Marketing databases naturally decay by about 22.5% every year — roughly 2.1% of contacts going stale each month. (HubSpot (MarketingSherpa research), 2025)
  • Email addresses are the fastest-decaying B2B data point, going bad at roughly 3.6% per month — around 43% per year. (ZoomInfo, 2025)
  • Depending on data type and industry, aggregate B2B contact data decays between 22.5% and 70% annually. (ZoomInfo, 2025)
  • The average email bounce rate across all industries is 2.33%, a key indicator of how much list decay has gone unaddressed. (GetResponse Email Marketing Benchmarks, 2024)

Segmentation & Personalization Lift

  • Segmented email campaigns earn 14.31% higher open rates and 100.95% higher click rates than non-segmented campaigns. (Mailchimp, 2025)
  • Segmented campaigns also protect list health, driving 9.37% fewer unsubscribes, 4.65% fewer bounces, and 3.90% fewer abuse reports than unsegmented sends. (Mailchimp, 2025)
  • Campaigns segmented by subscriber interest groups see 74.53% higher clicks and 25.65% lower unsubscribe rates than unsegmented campaigns. (Mailchimp, 2025)
  • 41% of readers unsubscribe from email lists because the content is irrelevant to their interests. (beehiiv, 2025)

Automation & Lifecycle Emails

  • Welcome emails are the highest-performing email type, averaging an 83.63% open rate and a 16.60% click-through rate. (GetResponse Email Marketing Benchmarks, 2024)
  • Automated emails drove 37% of all email-generated sales despite accounting for just 2% of email send volume. (Omnisend, 2025)
  • Automated emails achieve 52% higher open rates, 332% higher click rates, and 2,361% better conversion rates than regular scheduled campaigns. (Omnisend, 2025)
  • Automated email flows deliver 3x higher click rates (5.58% vs 1.69%) and 13x higher placed-order rates than one-off campaigns, generating 41% of email revenue from just 5.3% of sends. (Klaviyo (183,000+ brands analyzed), 2026)
  • Roughly one in two people who click on an automated welcome or abandoned-cart email end up making a purchase. (Omnisend, 2025)

Testing, Analytics & AI in Email

  • Brands that use email analytics to measure performance see a 43% higher email marketing ROI than those that don't. (Litmus State of Email, 2025)
  • Use of generative AI to create email images grew 340% among marketers between 2024 and 2025. (Litmus State of Email, 2025)
  • 22% of email marketers struggle to measure and prove ROI, and 16% cite personalization at scale as their biggest difficulty. (Litmus State of Email, 2025)

Send Time & Frequency

  • Friday delivers the highest average email open rate of any weekday at 49.72%, narrowly beating Monday's 49.44%. (MailerLite, 2026)
  • The 8–11 AM window earns the most email opens on weekdays, while clicks peak in the 8–9 PM evening window. (MailerLite, 2026)
  • 65.62% of newsletter creators send weekly, compared with 15.82% sending daily and only 6.27% sending monthly. (beehiiv, 2025)
  • 50% of readers unsubscribe from email lists because they receive too many emails. (beehiiv, 2025)
  • Roughly 70% of email opens and 85% of clicks happen within the first 24 hours after sending. (GetResponse Email Marketing Benchmarks, 2024)

Unsubscribe & Complaint Benchmarks

  • The average unsubscribe rate climbed to 0.22% in 2025, a notable increase over the prior year. (MailerLite, 2025)
  • GetResponse benchmarks put the average unsubscribe rate at 0.15% and the average spam complaint rate below 0.01% of sends. (GetResponse Email Marketing Benchmarks, 2024)
  • HubSpot's list-health benchmarks show an average bounce rate of 2.48% and an average unsubscribe rate of 0.22% across industries. (HubSpot, 2025)

Cost of Dirty Lists to Marketers

  • Poor-quality contact data costs the average organization approximately $15 million per year, according to Gartner estimates. (Gartner (via ZoomInfo), 2025)
  • Each decayed contact record costs roughly $100 in wasted rep time, failed outreach, and sender-reputation damage. (ZoomInfo, 2025)
  • 75% of companies that cut data-quality investment saw sales and marketing performance decline, while 94% of those that increased it reported improvement. (ZoomInfo, 2025)
  • Segmented, well-maintained lists bounce 4.65% less and generate 3.90% fewer abuse reports than untargeted blasts to unmaintained lists. (Mailchimp, 2025)

Methodology: every statistic above was individually verified against its linked source in August 2026. Statistics whose sources could not be verified were excluded. When citing, please link the original source named next to each figure.