How to Improve Email Open Rates
Tip 1: Clean Your List Regularly — Unengaged Subscribers Kill Deliverability
A large email list is not an asset if a significant percentage of it is unengaged. Inbox providers score your sender reputation based on how your subscribers respond to your emails. High delete-without-opening rates, spam reports, and persistent non-engagement all signal to Gmail and Yahoo that your emails are not worth delivering to the inbox.
39% of senders rarely or never conduct list hygiene — a dangerous negligence given that one spam trap hit can tank domain reputation for months. Run a quarterly list hygiene process: suppress subscribers with no opens or clicks in the last 180 days (after running a re-engagement campaign), remove hard bounces immediately, and remove soft bounces after three failed delivery attempts.
Email verification services — ZeroBounce, NeverBounce, and BriteVerify — verify email address validity before they cause deliverability damage. Investing in email verification delivers 10-20× ROI by preventing blacklisting and protecting domain reputation for the entire list. A cleaned list of 10,000 engaged subscribers consistently outperforms a dirty list of 50,000 in inbox placement, open rates, and revenue per send.
Tip 2: Optimise the Preview Text — the Second Subject Line You Are Ignoring
Preview text — the snippet of text displayed alongside or beneath the subject line in most email clients — is the second most read element of any email before the open decision is made. Most email marketers leave it to default, which populates with the first line of the email body. Many times this is “View this email in your browser” — actively working against your open rate.
Write custom preview text for every email that complements rather than repeats the subject line. If your subject line creates curiosity, use preview text to reinforce the benefit. If your subject line states the offer, use preview text to add a detail or create urgency. The combined character budget for subject line and preview text is approximately 75-140 characters total in most email clients — use all of it deliberately. Preview text optimisation is one of the highest-return, lowest-effort improvements available to any email programme that has not yet addressed it.
Tip 3: Fix Your Sender Name — People Open Emails From People They Trust
The sender name is the most-read element of any email — more read than the subject line, because readers filter by sender before they even evaluate what is being sent. Yet most brand email programmes still send from generic addresses like “noreply@brand.com” or “[Brand] Marketing.”
Test sending from a person’s name associated with your brand — “Sarah at [Brand],” “Vincent from [Brand]” — particularly for newsletter and relationship-building emails. HubSpot’s email marketing research consistently shows that emails from named individuals generate higher open rates than those from brand accounts alone, because the inbox appears as a communication from a person rather than a broadcast from a brand. Reserve transactional and promotional emails for the brand name. Use human names for editorial and value-delivery emails.
Tip 4: Maintain Strong Email Authentication — SPF, DKIM, DMARC, and BIMI
Email authentication is not optional in 2026. In February 2024, Google and Yahoo introduced mandatory authentication requirements for bulk senders — requiring SPF, DKIM, and DMARC records to be properly configured or facing significant deliverability consequences including rejection or spam folder placement.
The four authentication records every email sender must have configured:
- SPF (Sender Policy Framework): Tells receiving mail servers which IP addresses are authorised to send email from your domain. Configure through your DNS provider.
- DKIM (DomainKeys Identified Mail): Adds a cryptographic signature to outgoing emails that receiving servers use to verify the email has not been tampered with in transit. Your email platform (Klaviyo, Mailchimp, HubSpot) provides the DKIM record to add to your DNS.
- DMARC (Domain-based Message Authentication): Tells receiving servers what to do with emails that fail SPF or DKIM checks (quarantine or reject), and provides reporting on who is sending email on your behalf. Required for all senders sending over 5,000 emails per day to Gmail accounts.
- BIMI (Brand Indicators for Message Identification): Displays your brand logo next to your emails in supported clients (Gmail, Apple Mail, Yahoo) — requires a Verified Mark Certificate (VMC) but produces documented open rate improvements for brands that implement it, because the logo provides an immediate trust signal in the inbox.
Use MXToolbox’s email header analyser to check your current authentication status. Use Mail-Tester.com to send a test email and receive a spam score and authentication report before any major campaign send.
Tip 5: Build Welcome and Automated Flows — Where Open Rates Are Highest
The single most impactful thing most email programmes can do to improve their average open rate is invest in automated email flows — because flows consistently achieve dramatically higher open rates than broadcast campaigns.
Klaviyo’s 2026 benchmark data shows automated flows generate 41% of email revenue from just 5.3% of total sends, with revenue per recipient nearly 18 times higher than campaign sends. Welcome sequences, abandoned cart flows, and post-purchase sequences all achieve open rates of 48-65% — well above campaign averages — because they are triggered by specific subscriber actions that indicate peak relevance and intent.
The minimum automated flow set for any e-commerce or lead-generating business: a 3-5 email welcome series (sent immediately, day 3, and day 7 after signup), an abandoned cart sequence (1 hour, 24 hours, 72 hours after abandonment), and a post-purchase sequence (order confirmation, shipping confirmation, 7-day review request, 30-day product education). These three flows alone — properly configured in Klaviyo, Omnisend, or ActiveCampaign — typically generate more email revenue than the entire broadcast campaign programme for most mid-sized e-commerce businesses.
Tip 6: Monitor Deliverability, Not Just Open Rate
The most important open rate improvement you can make is ensuring your emails are reaching the inbox rather than the spam folder — because emails that land in spam have a 0% open rate regardless of how good the subject line is.
Deliverability monitoring should include: inbox placement rate (the percentage of delivered emails that land in the primary inbox versus spam or promotions folders), sender reputation score, and spam report rate. Tools like Litmus’s deliverability tools and Validity’s Everest platform provide inbox placement testing across major email clients before you send — showing you exactly how your email will appear in Gmail, Apple Mail, Outlook, and Yahoo before it reaches a single subscriber.
Monitor your spam report rate in your ESP dashboard. Google’s spam threshold is 0.1% — above 0.08% triggers reduced inbox placement, and above 0.3% triggers aggressive filtering. If your spam rate is approaching these thresholds, list hygiene and content relevance are your first priorities — not subject line testing.
The Open Rate Truth: What the Number Actually Tells You in 2026
Email open rate in 2026 is best understood as a deliverability proxy rather than an engagement metric. It tells you whether your emails are reaching the inbox (if open rates drop significantly, deliverability may have degraded) and gives you a directional signal for subject line performance. What it cannot tell you — due to MPP inflation — is how many humans actually read your email.
The metrics that tell you how many humans engaged with your email content: click rate, CTOR, reply rate (for B2B), revenue per recipient, and conversion rate from email traffic. Focus your optimisation energy on these metrics. Use open rate as a warning signal and a directional indicator, not as your primary performance measure.
The businesses winning with email in 2026 are not those with the highest open rates. They are those with the cleanest lists, the strongest deliverability, the most relevant segmentation, and the most consistent automated flow infrastructure. Those things produce both higher genuine engagement and the sustainable email revenue that compounds over time.
Frequently Asked Questions
What is a good email open rate in 2026?
In 2026, average email open rates sit between 37-43% across most industries — but this number is significantly inflated by Apple’s Mail Privacy Protection, which pre-loads tracking pixels for Apple Mail users (approximately 46% of all email clients) without any human opening the email. MailerLite’s 2026 benchmark data shows industry open rates ranging from 30.1% to 55.71%. Rather than comparing against an absolute benchmark, compare your open rate to your own historical baseline — a 5%+ drop from your rolling 12-month average indicates a deliverability or subject line problem requiring investigation.
Why did my email open rates suddenly increase in 2021 and 2022?
The open rate increase most email marketers saw in late 2021 and 2022 was caused by Apple’s iOS 15 Mail Privacy Protection, which began pre-loading email images (including tracking pixels) for Apple Mail users — registering opens even when no human actually opened the email. A study of over 80,000 email marketing accounts found open rates had risen by 18 percentage points after MPP was introduced — without any corresponding increase in actual engagement. This inflation has since stabilised at the new higher baseline, making comparisons to pre-2021 open rates misleading.
What email metrics should I track instead of open rate in 2026?
The metrics that accurately reflect genuine email engagement in 2026, unaffected by Apple MPP inflation: Click-to-Open Rate (CTOR — percentage of openers who clicked, the best measure of content quality), click rate (percentage of total recipients who clicked any link), conversion rate (percentage of email recipients who completed the desired action), revenue per recipient (total email revenue divided by emails sent — the most comprehensive e-commerce email KPI), reply rate (particularly for B2B), and spam report rate (the most critical deliverability health metric). Klaviyo’s 2026 benchmark data shows the average campaign CTOR is significantly more reliable than raw open rate for evaluating content performance.
How do Google and Yahoo’s 2024 email authentication requirements affect open rates?
In February 2024, Google and Yahoo introduced mandatory SPF, DKIM, and DMARC authentication requirements for bulk email senders. Emails that fail these authentication checks face quarantine or rejection — meaning they never reach the inbox and therefore generate no opens. Ensuring your domain has properly configured SPF, DKIM, and DMARC records is the foundational deliverability requirement for any email programme in 2026. Use MXToolbox to verify your authentication status and Mail-Tester.com to check your spam score before major campaigns.