{"id":17253,"date":"2025-10-29T14:32:09","date_gmt":"2025-10-29T14:32:09","guid":{"rendered":"https:\/\/lite14.net\/blog\/?p=17253"},"modified":"2025-10-29T14:32:09","modified_gmt":"2025-10-29T14:32:09","slug":"mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones","status":"publish","type":"post","link":"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/","title":{"rendered":"Mobile-optimized design becomes crucial as over 70% of email opens occur on smartphones."},"content":{"rendered":"<p>&nbsp;<\/p>\n<hr \/>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#_The_Data_Mobile_Dominance_in_Email_Opens\" >\u00a0The Data: Mobile Dominance in Email Opens<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#_Why_It_Matters\" >\u00a0Why It Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#_Best_Practice_Design_Strategies_for_Mobile_Email\" >\u00a0Best Practice Design Strategies for Mobile Email<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#_Summary\" >\u00a0Summary<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#_Case_Studies\" >\u00a0Case Studies<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#Case_Study%E2%80%AF1_CareerBuilder_via_Econsultancy\" >Case Study\u202f1: CareerBuilder (via Econsultancy)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#Case_Study%E2%80%AF2_Tsubo_Footwear_Brand_under_Deckers_Brands\" >Case Study\u202f2: Tsubo (Footwear Brand under Deckers Brands)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#Case_Study%E2%80%AF3_Industry%E2%80%91wide_data_from_Invesp\" >Case Study\u202f3: Industry\u2011wide data from Invesp<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#_Industry_Comments_Insights\" >\u00a0Industry Comments &amp; Insights<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/#_Key_Themes_Implications\" >\u00a0Key Themes &amp; Implications<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"_The_Data_Mobile_Dominance_in_Email_Opens\"><\/span>\u00a0The Data: Mobile Dominance in Email Opens<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>A 2024 report by Mailjet found that <strong>71.5% of email opens<\/strong> occurred on smartphones. (<a title=\"R E S E A R C H  R E P O R T\" href=\"https:\/\/www.mailjet.com\/wp-content\/uploads\/pdf\/EN-RR-MJ-Email-Engagement-2024.pdf?utm_source=chatgpt.com\">Mailjet<\/a>)<\/li>\n<li>Other sources estimate that <strong>more than 60%<\/strong> of all email opens happen on mobile devices (smartphones + tablets). (<a title=\"Mobile Email Statistics - AovUp (formerly Woosuite)\" href=\"https:\/\/aovup.com\/stats\/mobile-email\/?utm_source=chatgpt.com\">AovUp (formerly Woosuite)<\/a>)<\/li>\n<li>Responsive\/mobile\u2011optimized emails are shown to produce higher click rates: emails with mobile\u2011friendly design see a <strong>15% increase in mobile clicks<\/strong> versus those that aren\u2019t optimized. (<a title=\"The Importance of Optimizing Your Email for Mobile Devices - Invesp\" href=\"https:\/\/www.invespcro.com\/blog\/email-mobile-optimization\/?utm_source=chatgpt.com\">Invesp<\/a>)<\/li>\n<li>Conversely, poor mobile experience heavily penalizes brands: up to ~70% of users say they delete emails immediately if they don\u2019t render well on a mobile device. (<a title=\"The Importance of Optimizing Your Email for Mobile Devices - Invesp\" href=\"https:\/\/www.invespcro.com\/blog\/email-mobile-optimization\/?utm_source=chatgpt.com\">Invesp<\/a>)<\/li>\n<\/ul>\n<p><strong>Takeaway:<\/strong> With the majority of opens occurring on mobile, designing for mobile devices is no longer optional\u2014it\u2019s essential.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"_Why_It_Matters\"><\/span>\u00a0Why It Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><strong>First touch is often mobile<\/strong><br \/>\nMany recipients open their email first on their phone, possibly while commuting, waiting, or on the move. If the email doesn\u2019t display well, you lose the moment of opportunity.<\/li>\n<li><strong>Engagement &amp; click\u2011through improve with mobile optimization<\/strong><br \/>\nWhen emails are designed for mobile \u2013 readable text, tappable buttons, layouts that fit the screen \u2013 users are more likely to click and convert.<\/li>\n<li><strong>Brand perception and trust<\/strong><br \/>\nA badly rendered email on mobile (e.g., tiny text, misaligned content, horizontal scrolling) reduces trust and can lead to unsubscribes or surprise negative associations with the brand.<\/li>\n<li><strong>Competitive necessity<\/strong><br \/>\nAs more brands adopt mobile\u2011first design, any email that doesn\u2019t will be at a disadvantage\u2014lower engagement, higher bounce\/exit rates.<\/li>\n<\/ol>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"_Best_Practice_Design_Strategies_for_Mobile_Email\"><\/span>\u00a0Best Practice Design Strategies for Mobile Email<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here are key design considerations to ensure your emails are optimized for mobile users:<\/p>\n<ul>\n<li><strong>Responsive layout \/ single\u2011column design<\/strong>: Use a fluid layout that adapts to narrow screens, avoid multi\u2011column layouts that squeeze content. (<a title=\"What are the best practices for optimizing emails for mobile devices?\" href=\"https:\/\/createtheways.com\/what-are-the-best-practices-for-optimizing-emails-for-mobile-devices\/?utm_source=chatgpt.com\">Create The Ways<\/a>)<\/li>\n<li><strong>Readable text size &amp; spacing<\/strong>: Ensure fonts are large enough for mobile readability (e.g., minimum ~16\u202fpx for body text) and adequate line spacing so readers don\u2019t have to pinch\/zoom.<\/li>\n<li><strong>Large tappable buttons and links<\/strong>: Make CTAs easy to tap with a finger; recommend at least 44\u00d744\u202fpx tappable area (as per mobile usability guidelines).<\/li>\n<li><strong>Optimize images and load time<\/strong>: Mobile connections may be slower; compress images, use lighter HTML, avoid large file sizes.<\/li>\n<li><strong>Concise subject lines &amp; pre\u2011headers<\/strong>: On mobile devices the visible subject and pre\u2011header text are limited\u2014front\u2011load key message and value.<\/li>\n<li><strong>Clear focal point and CTA<\/strong>: On a mobile screen you have limited real estate; make sure the user can immediately see what action they should take.<\/li>\n<li><strong>Test across devices &amp; clients<\/strong>: Mobile email clients vary widely (iOS, Android, Gmail app, etc.). Use preview\/testing tools to ensure rendering and interaction work across major clients. (<a title=\"Mobile Influence on Email Marketing Software Trends and Challenges | MoldStud\" href=\"https:\/\/moldstud.com\/articles\/p-the-impact-of-mobile-on-email-marketing-software-development-trends-challenges-and-innovations?utm_source=chatgpt.com\">MoldStud<\/a>)<\/li>\n<li><strong>Mobile\u2011first content mindset<\/strong>: Assume the majority of your audience is reading on mobile. Plan copy, visuals, and flow accordingly.<\/li>\n<li><strong>Accessible design<\/strong>: Use sufficient colour contrast, alt text for images, and ensure navigation and buttons can be used on touch devices.<\/li>\n<li><strong>Mobile post\u2011click experience<\/strong>: Ensure that whatever you link to (landing page, product) is also mobile\u2011optimized\u2014otherwise you lose the user after the email.<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"_Summary\"><\/span>\u00a0Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In short:<\/p>\n<ul>\n<li>With <strong>70%+ of email opens<\/strong> happening on mobile devices, mobile\u2011optimized design is <strong>critical<\/strong> for email marketing success in 2025.<\/li>\n<li>Emails that render well on mobile lead to <strong>higher engagement, clicks and conversions<\/strong>; those that don\u2019t risk being deleted quickly or ignored.<\/li>\n<li>Good mobile design isn\u2019t just about shrinking the desktop version\u2014it requires thinking mobile\u2011first from layout, content, design, CTA, to post\u2011click experience.<\/li>\n<\/ul>\n<p>Here are several <strong>case studies<\/strong> and <strong>industry comments<\/strong> illustrating how mobile\u2011optimized email design is crucial \u2014 especially given that 60\u201170%+ of email opens now happen on smartphones \u2014 and how brands are adapting (or failing to).<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"_Case_Studies\"><\/span>\u00a0Case Studies<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Case_Study%E2%80%AF1_CareerBuilder_via_Econsultancy\"><\/span>Case Study\u202f1: CareerBuilder (via Econsultancy)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>After switching to a responsive email design (mobile\u2011optimized template) the brand achieved a <strong>15\u201117% increase in open rates<\/strong> and a <strong>21\u201124% increase in click\u2011through\u2011rate (CTR)<\/strong>. (<a title=\"Responsive email design: five case studies and an infographic on how it improves engagement\" href=\"https:\/\/econsultancy.com\/responsive-email-design-five-case-studies-and-an-infographic-on-how-it-improves-engagement\/?utm_source=chatgpt.com\">Econsultancy<\/a>)<\/li>\n<li>For example: their mobile opens rose (iPhone opens went from ~15% to ~18%). (<a title=\"Responsive email design: five case studies and an infographic on how it improves engagement\" href=\"https:\/\/econsultancy.com\/responsive-email-design-five-case-studies-and-an-infographic-on-how-it-improves-engagement\/?utm_source=chatgpt.com\">Econsultancy<\/a>)<\/li>\n<li><strong>Key takeaway<\/strong>: Responding to the fact that a significant share of opens were on mobile, the design change had measurable uplift in engagement.<\/li>\n<\/ul>\n<hr \/>\n<h3><span class=\"ez-toc-section\" id=\"Case_Study%E2%80%AF2_Tsubo_Footwear_Brand_under_Deckers_Brands\"><\/span>Case Study\u202f2: Tsubo (Footwear Brand under Deckers Brands)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>When Tsubo transitioned to mobile\u2011optimized\/responsive email templates (recognising that 35\u201165% of their subscribers opened on mobile) they saw ~<strong>10% increase in CTR<\/strong>. (<a title=\"Responsive email design: five case studies and an infographic on how it improves engagement\" href=\"https:\/\/econsultancy.com\/responsive-email-design-five-case-studies-and-an-infographic-on-how-it-improves-engagement\/?utm_source=chatgpt.com\">Econsultancy<\/a>)<\/li>\n<li><strong>Insight<\/strong>: Even a modest improvement in mobile design can translate into meaningful lift in engagement.<\/li>\n<\/ul>\n<hr \/>\n<h3><span class=\"ez-toc-section\" id=\"Case_Study%E2%80%AF3_Industry%E2%80%91wide_data_from_Invesp\"><\/span>Case Study\u202f3: Industry\u2011wide data from Invesp<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Invesp reports that \u201cmore than 2\/3 of emails are being opened on smartphones and tablets.\u201d (<a title=\"The Importance of Optimizing Your Email for Mobile Devices - Invesp\" href=\"https:\/\/www.invespcro.com\/blog\/email-mobile-optimization\/?utm_source=chatgpt.com\">Invesp<\/a>)<\/li>\n<li>They also found that responsive (mobile\u2011optimized) emails achieved a <strong>15% increase in unique clicks<\/strong> for mobile users (from 2.7% to 3.3%). (<a title=\"The Importance of Optimizing Your Email for Mobile Devices - Invesp\" href=\"https:\/\/www.invespcro.com\/blog\/email-mobile-optimization\/?utm_source=chatgpt.com\">Invesp<\/a>)<\/li>\n<li>The cost of neglecting mobile: about <strong>70% of consumers delete emails immediately<\/strong> if they don\u2019t render well on their mobile device. (<a title=\"The Importance of Optimizing Your Email for Mobile Devices - Invesp\" href=\"https:\/\/www.invespcro.com\/blog\/email-mobile-optimization\/?utm_source=chatgpt.com\">Invesp<\/a>)<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"_Industry_Comments_Insights\"><\/span>\u00a0Industry Comments &amp; Insights<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>From an article on mobile\u2011first email design:<br \/>\n<blockquote><p>\u201cAccording to Litmus\u2019 study of more than one\u202fbillion monthly email\u2011opens, a whopping 54% of emails were viewed on mobile devices and only 19% were viewed on desktop.\u201d (<a title=\"How To Master Mobile-First Email Design (and Why It\u2019s So Important)\" href=\"https:\/\/emailmastery.org\/articles\/mobile-first-email-design\/?utm_source=chatgpt.com\">Email Mastery<\/a>)<br \/>\nThis emphasises the scale of the mobile\u2011open majority.<\/p><\/blockquote>\n<\/li>\n<li>From Smart\u202fInsights:<br \/>\n<blockquote><p>\u201cDespite the increase in number of mobile devices, only half of marketers are designing email with mobile in mind\u2026 there is a huge drop in the percentage who are clicking through.\u201d (<a title=\"7 techniques to make your email more engaging for mobile subscribers | Smart Insights\" href=\"https:\/\/www.smartinsights.com\/email-marketing\/mobile-email-marketing\/engaging-mobile-devices\/?utm_source=chatgpt.com\">Smart Insights<\/a>)<br \/>\nThis highlights the gap between open behaviour and click behaviour when mobile design is overlooked.<\/p><\/blockquote>\n<\/li>\n<li>Practitioner comment from Reddit:<br \/>\n<blockquote><p>\u201cIn\u202f2025, the majority of email opens are on mobile (some niches see 70%+). If your emails don\u2019t load fast, use large readable text, and have tappable CTAs, you\u2019re basically throwing away conversions.\u201d (<a title=\"How important is mobile optimization for email campaigns in 2025?\" href=\"https:\/\/www.reddit.com\/\/r\/Emailmarketing\/comments\/1n6bpsm?utm_source=chatgpt.com\">Reddit<\/a>)<br \/>\nThis reinforces that for mobile\u2011heavy audiences, design flaws directly harm results.<\/p><\/blockquote>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"_Key_Themes_Implications\"><\/span>\u00a0Key Themes &amp; Implications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Mobile dominates opens<\/strong>: The data suggests that more than half \u2014 in some reports ~70% \u2014 of email opens are happening on mobile phones. Failing here means missing the majority of engagements.<\/li>\n<li><strong>Design matters for clicks, not just opens<\/strong>: While many opens happen on mobile, click\u2011through and conversion often suffer when the email wasn\u2019t optimized for mobile (e.g., hard to read, tiny CTAs, horizontal scroll).<\/li>\n<li><strong>Responsive templates and mobile\u2011first design yield measurable uplift<\/strong>: As seen in the CareerBuilder and Tsubo examples, redesigning for mobile leads to higher CTRs, better mobile engagement.<\/li>\n<li><strong>Neglecting mobile design carries risk<\/strong>: Emails that don\u2019t render well may be deleted quickly, unsubscribed, or ignored altogether. The Invesp stat that ~70% of users will delete poorly rendered mobile email underlines this risk.<\/li>\n<li><strong>Design best\u2011practices must evolve<\/strong>: Important design considerations include single\u2011column layouts, large tappable buttons, readable fonts, minimal horizontal scroll, lightweight load, and fast render speed.<\/li>\n<li><strong>Mobile first \u2260 desktop second<\/strong>: Many emails are still designed for desktop and then \u201cshrunk\u201d to mobile. True mobile\u2011first means designing <em>for the phone<\/em> experience and letting it adapt to desktop.<\/li>\n<li><strong>Measurement &amp; benchmarking matter<\/strong>: Brands should track mobile opens, mobile click\u2011through, device share of opens and clicks \u2014 and benchmark mobile vs desktop performance to identify gaps.<\/li>\n<li><strong>Audience behaviour nuances<\/strong>: While mobile dominates opens, some deeper conversions may still happen on desktop \u2014 so designing the mobile \u2192 later desktop journey may matter too. (See the Smashing\u202fMagazine commentary) (<a title=\"Design Your Mobile Emails To Increase On-Site Conversion \u2014 Smashing Magazine\" href=\"https:\/\/www.smashingmagazine.com\/2019\/06\/design-mobile-emails-increase-on-site-conversion\/?utm_source=chatgpt.com\">Smashing Magazine<\/a>)<\/li>\n<\/ul>\n<hr \/>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; \u00a0The Data: Mobile Dominance in Email Opens A 2024 report by Mailjet found that 71.5% of email opens occurred on smartphones. (Mailjet) Other sources&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[270,90],"tags":[],"class_list":["post-17253","post","type-post","status-publish","format-standard","hentry","category-digital-marketing","category-news-update"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mobile-optimized design becomes crucial as over 70% of email opens occur on smartphones. - Lite14 Tools &amp; Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lite14.net\/blog\/2025\/10\/29\/mobile-optimized-design-becomes-crucial-as-over-70-of-email-opens-occur-on-smartphones\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mobile-optimized design becomes crucial as over 70% of email opens occur on smartphones. - Lite14 Tools &amp; Blog\" \/>\n<meta property=\"og:description\" content=\"&nbsp; \u00a0The Data: Mobile Dominance in Email Opens A 2024 report by Mailjet found that 71.5% of email opens occurred on smartphones. 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