{"id":25396,"date":"2025-06-18T23:26:36","date_gmt":"2025-06-18T23:26:36","guid":{"rendered":"https:\/\/www.gmass.co\/blog\/?p=25396"},"modified":"2025-06-18T23:26:36","modified_gmt":"2025-06-18T23:26:36","slug":"mail-merge-subject-lines","status":"publish","type":"post","link":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/","title":{"rendered":"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options"},"content":{"rendered":"<p><strong>Mail merge subject lines<\/strong>\u00a0are a make-or-break email minefield.<\/p>\n<p>Why? Most people think plopping someone&#8217;s first name into a subject line counts as personalization. (And maybe also throwing \u201cquick question\u201d in there as well.)<\/p>\n<p>The problem is, that\u2019s not enough anymore. At best, it&#8217;s lazy. At worst, it screams \u201cmass email\u201d \u2014 because, in the year 2025,<strong>\u00a0no one is fooled anymore into thinking first name = one-on-one message<\/strong>.<\/p>\n<p>Effective <a href=\"https:\/\/www.gmass.co\/blog\/mail-merge-personalization\/\">mail merge personalization<\/a>\u00a0goes several levels deeper. It shows <strong>you actually <\/strong><em><strong>understand<\/strong><\/em><strong>\u00a0the person<\/strong>\u00a0you&#8217;re emailing: their business, what\u2019s causing them pain, their urgent needs.<\/p>\n<p>In this guide, I&#8217;ll cover exactly what works (and what doesn&#8217;t) so you can write subject lines for your mail merge campaigns that get opened.<\/p>\n<h2 id=\"mail-merge-subject-l-nmdm\">Mail Merge Subject Lines: Table of Contents<\/h2>\n<ul>\n<li><a href=\"#what-you-shouldn-t-i-qspw\">What You Shouldn&#8217;t Include in Mail Merge Subject Lines<\/a>\n<ul>\n<li><a href=\"#just-first-names-nrri\">Just First Names<\/a><\/li>\n<li><a href=\"#generic-job-titles-zime\">Generic Job Titles<\/a><\/li>\n<li><a href=\"#overly-complex-merge-flbq\">Overly Complex Merge Fields<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#what-you-should-incl-yfda\">What You Should Include in Mail Merge Subject Lines<\/a>\n<ul>\n<li><a href=\"#company-names-when-f-riqe\">Company Names (When Formatted Correctly)<\/a><\/li>\n<li><a href=\"#specific-personalize-wfwg\">Specific Personalized Metrics<\/a><\/li>\n<li id=\"what-you-shouldn-t-i-qspw\"><a href=\"#competitor-names-viry\">Competitor Names<\/a><\/li>\n<li><a href=\"#industry-specific-te-xobs\">Industry-Specific Terminology<\/a><\/li>\n<li><a href=\"#location-based-infor-uutg\">Location-Based Information<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#the-best-tool-for-ma-iwyh\">The Best Tool for Mail Merge Subject Lines: GMass<\/a><\/li>\n<\/ul>\n<h2 id=\"just-first-names-nrri\">What You Shouldn&#8217;t Include in Mail Merge Subject Lines<\/h2>\n<p>Let&#8217;s start with the bad stuff.<\/p>\n<p>These are the mail merge subject line \u201cpersonalizations\u201d that actually hurt your open rates \u2014 and might even motivate someone to click \u201cmark as spam.\u201d<\/p>\n<h3>Just First Names<\/h3>\n<figure style=\"text-align: center;\"><a href=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-firstname.png\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-firstname.png\" alt=\"Just including someone's first name as a mail merge subject lines example\" width=\"1570\" height=\"892\" \/><\/a><\/figure>\n<p>Here&#8217;s the truth: putting someone&#8217;s first name in a subject line doesn&#8217;t make you look personal. It makes you look like every other marketer who thought they were being clever in 2006.<\/p>\n<p>Everyone knows you&#8217;re using mail merge when they see \u201cHey Sarah, quick question\u201d in their subject line. It&#8217;s been overdone to death, and recipients have become completely numb to it.<\/p>\n<p>Plus, and even more important, <strong>first names add zero actual value<\/strong>. They don&#8217;t tell the recipient why they should care about your email or what\u2019s in it for them.<\/p>\n<p><strong>Examples of what NOT to do:<\/strong><\/p>\n<ul>\n<li id=\"generic-job-titles-zime\">{FirstName}?<\/li>\n<li>{FirstName}, quick question<\/li>\n<li>Quick favor, {FirstName}?<\/li>\n<\/ul>\n<h3>Generic Job Titles<\/h3>\n<p>Job titles in subject lines are almost always a bad idea because <strong>they&#8217;re either too broad to be meaningful or they&#8217;re flat-out wrong<\/strong>.<\/p>\n<p>A <em>lot<\/em>\u00a0of the\u00a0job title data in the databases everyone uses is outdated, incomplete, or just plain inaccurate. Same deal if you\u2019re using an AI tool to do prospect research.<\/p>\n<p>Nothing kills credibility faster than addressing someone as &#8220;Marketing Manager&#8221; when they&#8217;ve been VP of Marketing for two years. Or when they\u2019re actually a hiring manager or engineer.<\/p>\n<p>Even when the title is correct, it <strong>doesn&#8217;t create any real connection or urgency<\/strong>. &#8220;Attention Marketing Manager&#8221; doesn\u2019t tell someone how you\u2019re going to help with <em>their<\/em>\u00a0specific urgent pain point.<\/p>\n<p><strong>Examples of what NOT to do:<\/strong><\/p>\n<ul>\n<li id=\"overly-complex-merge-flbq\">For {JobTitle}s only: new strategy guide<\/li>\n<li>Hey {JobTitle}, quick question about your goals<\/li>\n<li>{JobTitle} insights for Q4 planning<\/li>\n<\/ul>\n<h3>Overly Complex Merge Fields<\/h3>\n<figure style=\"text-align: center;\"><a href=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-longline.png\" data-rel=\"lightbox-image-1\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-longline.png\" alt=\"An overly long mail merged subject line\" width=\"1726\" height=\"910\" \/><\/a><\/figure>\n<p>Some people get so excited about mail merge\u2019s potential they try to cram everything into the subject line. The result is usually a mess.<\/p>\n<p>Complex merge fields can break, display incorrectly, or just look weird.<\/p>\n<p>Plus, <strong>long subject lines get cut off<\/strong>\u00a0in most email clients anyway \u2014 and are proven across billions of emails to have <strong>lower open rates<\/strong>.<\/p>\n<p>Keep it simple. One, maybe two merge fields maximum. Any more than that and you&#8217;re playing with fire.<\/p>\n<p><strong>Examples of what NOT to do:<\/strong><\/p>\n<ul>\n<li id=\"what-you-should-incl-yfda\">{FirstName} from {CompanyName}: {ProductName} results for {Industry} companies<\/li>\n<li>Re: {CompanyName}&#8217;s {Department} team and {CurrentPlatform} integration<\/li>\n<li>{FirstName}, {CompanyName}&#8217;s {JobTitle} position and our {ServiceType} solution<\/li>\n<\/ul>\n<h2>What You Should Include in Mail Merge Subject Lines<\/h2>\n<p>So if everything above is what you shouldn\u2019t use \u2014 what <em id=\"company-names-when-f-riqe\">should<\/em>\u00a0you use?<\/p>\n<p>These are the mail merge elements that can improve your open rates because they <strong>show deep knowledge, address real needs, and foster genuine curiosity<\/strong>.<\/p>\n<h3>Company Names (When Formatted Correctly)<\/h3>\n<figure style=\"text-align: center;\"><a href=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-cleandata.png\" data-rel=\"lightbox-image-2\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-cleandata.png\" alt=\"Not cleaning data before mail merging\" width=\"1682\" height=\"1034\" \/><\/a><\/figure>\n<p>Company names can be incredibly effective in subject lines \u2014 but only if your data is clean and the context makes sense.<\/p>\n<p>The key is making sure your company name appears natural. You don&#8217;t want &#8220;SEO audit for ACME CORPORATION INC&#8221; when &#8220;SEO audit for Acme&#8221; is what someone would type if this were a one-on-one pitch.<\/p>\n<p><strong>Clean your data first<\/strong>. Strip out &#8220;Inc,&#8221; &#8220;LLC,&#8221; &#8220;Corporation,&#8221; and other legal suffixes unless they&#8217;re actually part of how the company presents itself publicly. (You can <a href=\"https:\/\/www.gmass.co\/blog\/clean-extract-gpt-sheets\/\">use AI to handle data cleaning<\/a>\u00a0like this pretty efficiently.)<\/p>\n<p><strong>Examples that work:<\/strong><\/p>\n<ul>\n<li id=\"specific-personalize-wfwg\">How {CompanyName} can cut costs by 30%<\/li>\n<li>{CompanyName}&#8217;s SEO audit &#8211; I found {ErrorNum} errors<\/li>\n<li>Benchmark report: {CompanyName} vs. {TopCompetitor}<\/li>\n<\/ul>\n<h3>Specific Personalized Metrics<\/h3>\n<p>This is where mail merge subject lines really shine. When you can reference actual numbers, percentages, or metrics specific to each recipient, <strong>you create immediate relevance<\/strong>.<\/p>\n<p>Personalized metrics\u00a0work because <strong>they&#8217;re impossible to ignore<\/strong>\u00a0\u2014 the recipient knows you&#8217;ve done your homework. So <strong>even if they suspect this is a mass email blast, it\u2019s one that\u2019s fueled by real research and one-on-one attention<\/strong>.<\/p>\n<p>The more specific the metric, the better. Generic numbers don&#8217;t work (saying you\u2019ll improve someone\u2019s business \u201c10x\u201d is so much less compelling than saying you\u2019ll help grow their monthly traffic of 165,314 visitors by 42%).<\/p>\n<p><strong>Examples that work:<\/strong><\/p>\n<ul>\n<li id=\"competitor-names-viry\">Increase your {CurrentTraffic} monthly visitors by 42%<\/li>\n<li>Your {EmployeeCount}-person team&#8217;s retention strategy<\/li>\n<li>How to improve your {CVR}% conversion rate<\/li>\n<\/ul>\n<h3>Competitor Names<\/h3>\n<p>Mentioning a competitor in the subject line is psychological gold.<\/p>\n<p>It\u2019s <strong>triggering the fear center in someone\u2019s brain<\/strong>\u00a0if you do this right \u2014 which is a <em>fantastic<\/em>\u00a0way to get their undivided attention.<\/p>\n<p>The key is being subtle about it. You want to pique interest, not come across as gossipy or unprofessional. Frame it around insights, comparisons, or industry movements.<\/p>\n<p><strong>Examples that work:<\/strong><\/p>\n<ul>\n<li id=\"industry-specific-te-xobs\">Why {CompetitorName}\u2019s pricing strategy is working<\/li>\n<li>My 3 ideas for getting {CompetitorName}\u2019s customers to switch<\/li>\n<li>Benchmarking against {CompetitorName}&#8217;s new strategy<\/li>\n<\/ul>\n<h3>Industry-Specific Terminology<\/h3>\n<figure style=\"text-align: center;\"><a href=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-jargon.png\" data-rel=\"lightbox-image-3\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-jargon.png\" alt=\"A subject line using relevant jargon\" width=\"1662\" height=\"1196\" \/><\/a><\/figure>\n<p>Using the exact language your recipients use in their day-to-day work makes your email feel like it belongs in their inbox.<\/p>\n<p>This is especially powerful in B2B campaigns where different industries have their own jargon, metrics, and pain points. <strong>It shows you understand their world<\/strong>, which serves as important proof that (1) you\u2019re worth listening to and (2) you\u2019re worth hiring to fix the problem.<\/p>\n<p>But you <em>have<\/em>\u00a0to be\u00a0precise with the terminology, because they can spot a carpetbagger on sight.<\/p>\n<p><strong>Examples that work:<\/strong><\/p>\n<ul>\n<li id=\"location-based-infor-uutg\">Reducing your {SpecificMetric} by 25% this quarter (where SpecificMetric might be \u201cCAC,\u201d \u201cchurn rate,\u201d or \u201cCOGS\u201d)<\/li>\n<li>New {IndustryRegulation} compliance requirements<\/li>\n<li>Optimizing your {IndustryProcess} workflow (like \u201corder fulfillment\u201d for eCommerce or \u201cpatient intake\u201d for healthcare)<\/li>\n<\/ul>\n<h3>Location-Based Information<\/h3>\n<p>Geographic personalization works particularly well for local businesses, regional campaigns, or when referencing location-specific events or regulations.<\/p>\n<p>This <strong>creates immediate relevance<\/strong>\u00a0because it shows you understand their local market conditions, challenges, or opportunities.<\/p>\n<p>Location data is usually pretty reliable, making this a safe bet for personalization that won&#8217;t backfire.<\/p>\n<p><strong>Examples that work:<\/strong><\/p>\n<ul>\n<li id=\"the-best-tool-for-ma-iwyh\">Are you ready for\u00a0{State}\u2019s new tax regulations?<\/li>\n<li>{City} market expansion opportunities<\/li>\n<li>{LocalCompetitor} is dominating {City} \u2014 let\u2019s change that<\/li>\n<\/ul>\n<h2>The Best Tool for Mail Merge Subject Lines: GMass<\/h2>\n<p>In case you didn\u2019t know, <a href=\"https:\/\/www.gmass.co\/blog\/gmail-built-in-mail-merge\/\">Gmail has a built-in mail merge tool<\/a>, which it offers on some workspace plans.<\/p>\n<p>It\u2019s fairly rudimentary. And one of its biggest flaws is: It explicitly <strong>doesn&#8217;t allow subject line personalization<\/strong>. You can merge fields in the email body, but the subject line stays static. That&#8217;s a massive limitation that kills the effectiveness of your campaigns before they even start.<\/p>\n<p>Which is why <strong>hundreds of thousands of people<\/strong>\u00a0(nearly 400k at last count) <strong>use GMass instead of Google\u2019s own tool<\/strong>\u00a0for their <a href=\"https:\/\/www.gmass.co\/gmail-mail-merge\">Gmail mail merges<\/a>.<\/p>\n<p>If you\u2019re not familiar, GMass is a <a href=\"https:\/\/chrome.google.com\/webstore\/detail\/gmass-powerful-mail-merge\/ehomdgjhgmbidokdgicgmdiedadncbgf\">Chrome extension<\/a>\u00a0that <strong>works directly inside Gmail<\/strong>\u00a0\u2014 and it lets you use mail merge in subject lines.<\/p>\n<p>But GMass goes <em>way<\/em>\u00a0beyond that. After all, subject line personalization <em>should<\/em>\u00a0be table stakes. GMass also gives you:<\/p>\n<ul>\n<li><strong>Advanced mail merge personalization options<\/strong>\u00a0like <a href=\"https:\/\/www.gmass.co\/blog\/conditional-content\/\">conditional content<\/a>, <a href=\"https:\/\/www.gmass.co\/blog\/how-to-include-personalized-image-in-email-marketing-campaign\/\">personalized images<\/a>, <a href=\"https:\/\/www.gmass.co\/blog\/how-to-include-a-personalized-link-in-a-gmail-email-marketing-campaign\/\">personalized links<\/a>, and <a href=\"https:\/\/www.gmass.co\/blog\/mass-email-with-personalized-attachments\/\">personalized attachments<\/a>\u00a0\u2014 all via a <a href=\"https:\/\/www.gmass.co\/blog\/google-sheets-mail-merge\/\">Google Sheet<\/a>\u00a0of contacts.<\/li>\n<li><strong><a href=\"https:\/\/www.gmass.co\/blog\/new-feature-schedule-mass-emails\/\">Scheduling<\/a><\/strong><strong>\u00a0tools<\/strong>\u00a0to send your campaigns at the perfect time (including <a href=\"https:\/\/www.gmass.co\/blog\/choose-specific-days\/\">skipping weekends<\/a>\u00a0and <a href=\"https:\/\/www.gmass.co\/blog\/skip-holidays\/\">holidays<\/a>).<\/li>\n<li><strong>Detailed <\/strong><strong><a href=\"https:\/\/www.gmass.co\/features\/reporting\">analytics<\/a><\/strong>\u00a0so you can see which subject lines are actually working. GMass is one of the few email platforms that even shows you <a href=\"https:\/\/www.gmass.co\/blog\/false-opens-in-gmail\/\">open rates with bots removed<\/a>.<\/li>\n<li><strong><a href=\"https:\/\/www.gmass.co\/blog\/auto-follow-up-emails-until-reply\/\">Automated follow-ups<\/a><\/strong>\u00a0that keep your campaigns running until you get responses.<\/li>\n<li><strong>Deliverability tools<\/strong>\u00a0like <a href=\"https:\/\/www.gmass.co\/blog\/spam-solver-tweaks-emails\/\">Spam Solver<\/a>, which tests your campaign on real mailboxes and helps you improve your inbox placement rate.<\/li>\n<\/ul>\n<p>The best part? GMass slides seamlessly into Gmail, so <strong>sending a mass mail merge campaign isn\u2019t much different than sending your day-to-day emails<\/strong>.<\/p>\n<p>There&#8217;s no new platform to learn, no complicated setup process. You install the Chrome extension and <strong>start sending better mail merge campaigns immediately<\/strong>.<\/p>\n<p>Ready to start writing subject lines that actually get opened and drive results? Just <strong><a href=\"https:\/\/chrome.google.com\/webstore\/detail\/gmass-powerful-mail-merge\/ehomdgjhgmbidokdgicgmdiedadncbgf\">install the GMass extension<\/a><\/strong>\u00a0and try it free \u2014 <strong>no credit card required<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mail merge subject lines\u00a0are a make-or-break email minefield. Why? Most people think plopping someone&#8217;s first name into a subject line counts as personalization. (And maybe also throwing \u201cquick\u2026<\/p>\n","protected":false},"author":29,"featured_media":25398,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,30],"tags":[],"class_list":["post-25396","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gmail-mail-merge","category-open-rate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options<\/title>\r\n<meta name=\"description\" content=\"What personalization you should and shouldn&#039;t include in your mail merge subject lines to increase your open rates (and success rates).\" \/>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options\" \/>\r\n<meta property=\"og:description\" content=\"What personalization you should and shouldn&#039;t include in your mail merge subject lines to increase your open rates (and success rates).\" \/>\r\n<meta property=\"og:url\" content=\"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/\" \/>\r\n<meta property=\"og:site_name\" content=\"GMass Blog\" \/>\r\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/GmailMailMerge\/\" \/>\r\n<meta property=\"article:published_time\" content=\"2025-06-18T23:26:36+00:00\" \/>\r\n<meta property=\"og:image\" content=\"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-feat-tinified.png\" \/>\r\n\t<meta property=\"og:image:width\" content=\"2002\" \/>\r\n\t<meta property=\"og:image:height\" content=\"934\" \/>\r\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\r\n<meta name=\"author\" content=\"Sam Greenspan\" \/>\r\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\r\n<meta name=\"twitter:creator\" content=\"@GMassForGmail\" \/>\r\n<meta name=\"twitter:site\" content=\"@GMassForGmail\" \/>\r\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sam Greenspan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\r\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/\"},\"author\":{\"name\":\"Sam Greenspan\",\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/#\\\/schema\\\/person\\\/de82c1ac2f78713b569bb57bfb313c98\"},\"headline\":\"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options\",\"datePublished\":\"2025-06-18T23:26:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/\"},\"wordCount\":1512,\"commentCount\":2,\"image\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/06\\\/mailmergesubjectlines-feat-tinified.png\",\"articleSection\":[\"Gmail Mail Merge\",\"Open Rate\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/\",\"url\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/\",\"name\":\"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/06\\\/mailmergesubjectlines-feat-tinified.png\",\"datePublished\":\"2025-06-18T23:26:36+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/#\\\/schema\\\/person\\\/de82c1ac2f78713b569bb57bfb313c98\"},\"description\":\"What personalization you should and shouldn't include in your mail merge subject lines to increase your open rates (and success rates).\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/06\\\/mailmergesubjectlines-feat-tinified.png\",\"contentUrl\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/06\\\/mailmergesubjectlines-feat-tinified.png\",\"width\":2002,\"height\":934},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/mail-merge-subject-lines\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/\",\"name\":\"GMass Blog\",\"description\":\"Tips and tricks for sending mail merge and mass email campaigns directly from Gmail\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/#\\\/schema\\\/person\\\/de82c1ac2f78713b569bb57bfb313c98\",\"name\":\"Sam Greenspan\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/544dc4a3d6b96b537586cdde9d818feb8f0de187faed221fdb0dee3a356bf41a?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/544dc4a3d6b96b537586cdde9d818feb8f0de187faed221fdb0dee3a356bf41a?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/544dc4a3d6b96b537586cdde9d818feb8f0de187faed221fdb0dee3a356bf41a?s=96&d=mm&r=g\",\"caption\":\"Sam Greenspan\"},\"url\":\"https:\\\/\\\/www.gmass.co\\\/blog\\\/author\\\/sam_greenspan\\\/\"}]}<\/script>\r\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options","description":"What personalization you should and shouldn't include in your mail merge subject lines to increase your open rates (and success rates).","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/","og_locale":"en_US","og_type":"article","og_title":"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options","og_description":"What personalization you should and shouldn't include in your mail merge subject lines to increase your open rates (and success rates).","og_url":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/","og_site_name":"GMass Blog","article_publisher":"https:\/\/www.facebook.com\/GmailMailMerge\/","article_published_time":"2025-06-18T23:26:36+00:00","og_image":[{"width":2002,"height":934,"url":"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-feat-tinified.png","type":"image\/png"}],"author":"Sam Greenspan","twitter_card":"summary_large_image","twitter_creator":"@GMassForGmail","twitter_site":"@GMassForGmail","twitter_misc":{"Written by":"Sam Greenspan","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#article","isPartOf":{"@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/"},"author":{"name":"Sam Greenspan","@id":"https:\/\/www.gmass.co\/blog\/#\/schema\/person\/de82c1ac2f78713b569bb57bfb313c98"},"headline":"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options","datePublished":"2025-06-18T23:26:36+00:00","mainEntityOfPage":{"@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/"},"wordCount":1512,"commentCount":2,"image":{"@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#primaryimage"},"thumbnailUrl":"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-feat-tinified.png","articleSection":["Gmail Mail Merge","Open Rate"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/","url":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/","name":"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options","isPartOf":{"@id":"https:\/\/www.gmass.co\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#primaryimage"},"image":{"@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#primaryimage"},"thumbnailUrl":"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-feat-tinified.png","datePublished":"2025-06-18T23:26:36+00:00","author":{"@id":"https:\/\/www.gmass.co\/blog\/#\/schema\/person\/de82c1ac2f78713b569bb57bfb313c98"},"description":"What personalization you should and shouldn't include in your mail merge subject lines to increase your open rates (and success rates).","breadcrumb":{"@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#primaryimage","url":"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-feat-tinified.png","contentUrl":"https:\/\/www.gmass.co\/blog\/wp-content\/uploads\/2025\/06\/mailmergesubjectlines-feat-tinified.png","width":2002,"height":934},{"@type":"BreadcrumbList","@id":"https:\/\/www.gmass.co\/blog\/mail-merge-subject-lines\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.gmass.co\/blog\/"},{"@type":"ListItem","position":2,"name":"Mail Merge Subject Lines: 3 Secret Killers and 5 Smart Options"}]},{"@type":"WebSite","@id":"https:\/\/www.gmass.co\/blog\/#website","url":"https:\/\/www.gmass.co\/blog\/","name":"GMass Blog","description":"Tips and tricks for sending mail merge and mass email campaigns directly from Gmail","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.gmass.co\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.gmass.co\/blog\/#\/schema\/person\/de82c1ac2f78713b569bb57bfb313c98","name":"Sam Greenspan","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/544dc4a3d6b96b537586cdde9d818feb8f0de187faed221fdb0dee3a356bf41a?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/544dc4a3d6b96b537586cdde9d818feb8f0de187faed221fdb0dee3a356bf41a?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/544dc4a3d6b96b537586cdde9d818feb8f0de187faed221fdb0dee3a356bf41a?s=96&d=mm&r=g","caption":"Sam Greenspan"},"url":"https:\/\/www.gmass.co\/blog\/author\/sam_greenspan\/"}]}},"_links":{"self":[{"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/posts\/25396","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/users\/29"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/comments?post=25396"}],"version-history":[{"count":2,"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/posts\/25396\/revisions"}],"predecessor-version":[{"id":25399,"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/posts\/25396\/revisions\/25399"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/media\/25398"}],"wp:attachment":[{"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/media?parent=25396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/categories?post=25396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gmass.co\/blog\/wp-json\/wp\/v2\/tags?post=25396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}