{"id":40486,"date":"2024-01-24T19:08:00","date_gmt":"2024-01-25T00:08:00","guid":{"rendered":"https:\/\/www.validity.com\/?p=40486"},"modified":"2026-03-24T13:54:27","modified_gmt":"2026-03-24T17:54:27","slug":"top-ways-to-stress-test-your-email-program","status":"publish","type":"post","link":"https:\/\/www.litmus.com\/blog\/top-ways-to-stress-test-your-email-program","title":{"rendered":"Top Ways to Stress Test Your Email Program"},"content":{"rendered":"<table class=\"mt-3 mb-3\" style=\"background-color: #f2f3f6;\">\n<tbody>\n<tr>\n<td class=\"block-1\" style=\"padding: 20px;\">\n<h3>Key takeaways \u2728<\/h3>\n<ul>\n<li><span style=\"font-weight: 400;\"><strong>Stress tests reveal weaknesses in your email program<\/strong> before they become deliverability disasters. Proactively testing gives you the data to gradually fix problems as they pop up, rather than all at once.<\/span><\/li>\n<li><span style=\"font-weight: 400;\"><strong>Sudden volume spikes are a red flag to mailbox providers<\/strong>. Gradual IP warming is essential, so plan ramp-ups carefully and monitor deliverability throughout the process to protect your sender reputation.<\/span><\/li>\n<li><span style=\"font-weight: 400;\"><strong>List quality is a key area to test and improve<\/strong>. With layoffs and workforce changes making invalid addresses more common, regular validation is more important than ever for maintaining strong deliverability.<\/span><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Think your email marketing strategy is good enough to tackle the challenges this year has in store? There\u2019s only one way to find out\u2014and that\u2019s to stress-test your email program.<\/p>\n<p>Stress-testing means prompting different scenarios and analyzing the results, which can help you identify parts of your email program that are working well\u2014and those that need to be improved.<\/p>\n<p>This helps you optimize your email program for maximum performance. Plus, stress-testing can help you identify and fix any potential issues before they affect your bottom line. Score!<\/p>\n<p>Ready to watch your email performance soar to new heights? Let\u2019s explore how stress-testing can help you reach your goals.<\/p>\n<h3>Table of contents<\/h3>\n<ul>\n<li><a rel=\"noopener\" href=\"#why-test\">Why you should stress test your email program<\/a><\/li>\n<li><a rel=\"noopener\" href=\"#start\">Where to start<\/a><\/li>\n<li><a rel=\"noopener\" href=\"#top-ways\">Top ways to stress test your email grogram<\/a>\n<ul>\n<li><a rel=\"noopener\" href=\"#volume\">Volume increases<\/a><\/li>\n<li><a rel=\"noopener\" href=\"#quality\">List quality<\/a><\/li>\n<li><a rel=\"noopener\" href=\"#content\">Message content<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"why-test\">Why is now a good time to stress-test your email program?<\/h2>\n<p>Last year presented marketers with several challenges\u2014and this year will be no different. Businesses are feeling the pressure to perform in a worsening economic climate with widespread layoffs, evolving privacy concerns, and rapidly advancing technology.<\/p>\n<p>As you look to the future, it\u2019s important to keep email marketing strategy strong enough to handle the unknown. Stress-testing your email program is a good first step, and there are a variety of tests email marketers can run to keep their email programs safe and effective.<\/p>\n<h2 id=\"start\">Where should you begin?<\/h2>\n<p>Before starting your stress test, there\u2019s one thing you need to do: plan it out!<\/p>\n<p>Having a <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.validity.com\/email-marketing\/email-testing\/\">testing framework<\/a> that includes the following steps helps you get the best possible results.<\/p>\n<ul>\n<li>Define your goals<\/li>\n<li>Outline the scenarios and metrics you will use<\/li>\n<li>Set up a test environment to simulate the conditions of your test scenarios<\/li>\n<li>Run the test<\/li>\n<li>Measure and analyze the results<\/li>\n<li>Make any necessary changes to your email program<\/li>\n<\/ul>\n<p>Once you\u2019ve created a plan that determines <em>how<\/em> your tests will be conducted, you can identify which features of your email program you&#8217;d like to test.<\/p>\n<h2 id=\"top-ways\">Top ways to stress-test your email program<\/h2>\n<p>You can stress-test various elements of your email program to ensure it\u2019s capable of handling high volumes of outbound emails and maintaining strong deliverability throughout the year.<\/p>\n<p>It\u2019s important to note that, depending on your setup, you may be limited in what you can stress-test. For example, shared IP environments usually have limitations to allow fair usage of available resources. Be sure to identify any limitations during the planning process.<\/p>\n<p>Ready to get started? Here are some elements of your email program you can try stress-testing today:<\/p>\n\n<div class=\"container pt-3 pb-5 px-1\">\n\t<div class=\"row blog-cta-green rounded-5 p-4\">\n\t\t<div class=\"mx-auto col-12\">\n\t\t\t<div class=\"row d-flex align-items-center\">\n\t\t\t<div class=\"col-lg-6 col-12\">\n\t\t\t\t<p class=\"bold fs-4\">Hitting \u201csend\u201d doesn\u2019t have to be stressful<\/p>\n\t\t\t\t<p>See what your emails look like in 100+ email clients and shave hours off your QA process, with Litmus email testing. <a href=\"https:\/\/www.litmus.com\/email-testing\" class=\"bold\">Learn more.<\/a><\/p>\n\t\t\t\t<button class=\"button-blue arrow\"><a href=\"https:\/\/www.litmus.com\/pricing-litmus\" class=\"text-white text-decoration-none\">Book a demo<\/a><\/button>\n\t\t\t<\/div><!--col-6-->\n\t\t\t<div class=\"col-6 d-none d-lg-block\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.litmus.com\/wp-content\/uploads\/2022\/02\/test.svg\" width=\"210\" height=\"130\" alt=\"\">\n\t\t\t<\/div><!--col-6-->\n\t\t\t<\/div> <!--row-->\n\t\t<\/div><!--col-12-->\n\t<\/div><!--row-->\n<\/div><!--container-->\n\t\n\t\n\t\n\t\n\n<h3 id=\"volume\">1. Volume increases<\/h3>\n<p>Mailbox and blocklist providers are not fans of sudden volume swings. Why? These swings tend to mimic the behavior of compromised servers that are being used to send mass phishing and spam messages. Yikes.<\/p>\n<p>However, there are cases where there\u2019s a justified need to send large amounts of messages through your email servers. The general rule for any volume increase is to plan it out and reduce the risk through a process called <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.validity.com\/blog\/how-warm-is-warm-thinking-about-your-ip-address-warm-up-process\/\">IP warming<\/a>. This helps you gradually increase send volume rather than flipping the switch overnight.<\/p>\n<p>But what does that gradual increase look like? Should you increase your send volume by 30 percent, 40 percent, or even 50 percent? And should you be increasing it daily, every other day, or once every week? The answer: it depends. Increasing volume is stress-testing in its very essence. This is why monitoring deliverability and sender reputation is vital during <a rel=\"noopener\" href=\"https:\/\/www.litmus.com\/blog\/ip-domain-email-warm-up\">IP warming<\/a>.<\/p>\n<p>Consider implementing a deliverability solution like <a rel=\"noopener\" href=\"https:\/\/www.litmus.com\/email-deliverability\">Litmus Deliverability<\/a>. Litmus shows you which mailbox providers are placing your messages in the spam folder or blocking them altogether. So, instead of continuing to increase volume, you can adjust your ramp-up strategy accordingly.<\/p>\n<p>When sending to large lists, sending campaigns with lots of HTML code can take a long time.<\/p>\n<p>For example, let\u2019s say you send a message containing 102KB of HTML code (i.e., Gmail\u2019s <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/help.returnpath.com\/hc\/en-us\/articles\/224780827-Gmail-deliverability-best-practices\" target=\"_blank\" rel=\"noopener\">clipping limit<\/a>) to a list containing 10 million addresses. To do this, your email sending platform will need to push out over a terabyte of data in SMTP alone! It will take your server a while to process this\u2014and if personalization is added to the mix, it can take even longer.<\/p>\n<p>To stress-test your sending capacity, you\u2019ll need to send emails\u2014but not to real addresses. Tools like <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/mailtrap.io\/email-sandbox\/\" target=\"_blank\" rel=\"noopener\">Mailtrap<\/a>, <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/docs.aws.amazon.com\/ses\/latest\/dg\/send-an-email-from-console.html#send-email-simulator\" target=\"_blank\" rel=\"noopener\">SES mailbox simulator<\/a>, and <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/mailcatcher.me\/\" target=\"_blank\" rel=\"noopener\">MailCatcher<\/a> help with exactly that. Some senders even choose to use free <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.validity.com\/blog\/understanding-disposable-email-addresses-and-what-they-mean-for-email-deliverability\/\" target=\"_blank\" rel=\"noopener\">disposable email addresses<\/a>. These options allow you to test your sending capacity without risking your deliverability or sender reputation.<\/p>\n<p>Be sure to record how long it takes to push emails out in this controlled environment.<\/p>\n<h3 id=\"quality\">2. List quality<\/h3>\n<p>If there\u2019s anything mailbox providers can\u2019t stand, it\u2019s poor list quality. Sending to a low-quality list full of nonexistent, misspelled, or invalid email addresses is one of the quickest ways to tank your deliverability and harm your sender reputation.<\/p>\n<p>To alleviate the pressure of sending an initial message to learn if an address exists, try using an <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.validity.com\/briteverify\/\">email validation service<\/a>. This is especially useful when acquiring new subscribers, trying to talk to subscribers you haven\u2019t talked to in a while, or doing a regular list cleanup.<\/p>\n<p>With the global trend of mass layoffs, many email addresses are no longer active, which means regular list cleaning is more important than ever.<\/p>\n\n<div class=\"container pt-3 pb-5\">\n\t<div class=\"row blog-cta-blue  p-4\">\n\t\t<div class=\"col-12 mx-auto\">\n\t\t\t<div class=\"row d-flex align-items-center\">\n\t\t\t<div class=\"col-lg-6 col-12\">\n\t\t\t\t<p class=\"bold fs-4\">Don\u2019t let bad data cost you<\/p>\n\t\t\t\t<p>Validity BriteVerify helps you remove invalid emails before you send\u2014saving money and improving deliverability.<\/p>\n\t\t\t\t<button class=\"button-blue arrow\"><a href=\"https:\/\/www.validity.com\/briteverify\/\" class=\"text-white text-decoration-none\">Clean your list<\/a><\/button>\n\t\t\t<\/div><!--col-6-->\n\t\t\t<div class=\"col-6 d-none d-lg-block\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.litmus.com\/wp-content\/uploads\/2024\/12\/blog-cta-12172024.svg\" width=\"208\" height=\"171\" alt=\"\">\n\t\t\t<\/div><!--col-6-->\n\t\t\t<\/div> <!--row-->\n\t\t<\/div><!--col-12-->\n\t<\/div><!--row-->\n<\/div><!--container-->\n\t\n\t\t\n\t\n\t\n\t\n\n<h3 id=\"content\">3. Message content<\/h3>\n<p>One of the most important aspects of any email campaign is the content of the email itself, so it\u2019s crucial to test its effectiveness before hitting send.<\/p>\n<p>Here are some of the main content elements worth stress-testing:<\/p>\n<p><strong>Personalized elements<\/strong><\/p>\n<p>Consumers are demanding <a rel=\"noopener\" href=\"https:\/\/www.litmus.com\/email-personalization\">personalized email experiences<\/a> from brands. Studies show <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.attentive.com\/press-releases\/new-global-study-reveals-consumers-demand-more-personalization-in-marketing-81-ignore-irrelevant-messages-while-personalized-experiences-drive-loyalty-and-sales#\" target=\"_blank\" rel=\"noopener\">96% of consumers<\/a> are likely to purchase when brands send personalized messages. So, it\u2019s crucial your emails meet these expectations. Ensure placeholder content\u2014or dynamic blocks\u2014are correctly processing or are being replaced with personalized data. Also, consider using tools that allow you to access messages sent to monitored accounts. This allows Q&amp;A teams to perform validation.<\/p>\n<p><strong>Subject lines<\/strong><\/p>\n<p>While most of us have been taught not to judge a book by its cover, that won\u2019t stop subscribers from judging your email by its subject line. Therefore, it\u2019s important to check that subject lines and pre-header text are readable. Try using a <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/senderscore.org\/act\/subject-line-previewer\/\">subject line previewer tool<\/a> to gain\u202finsight into\u202fhow the text looks on\u202fdifferent devices and across different email clients. That way you\u2019ll have the opportunity to\u202ftweak the copy before hitting send.<\/p>\n<p>Now that AI is also in the inbox, you should optimize your subject lines for AI reading and summarizing your email\u2014including your subject line.<\/p>\n<p><strong>Email design<\/strong><\/p>\n<p>You work hard to make sure your emails look excellent, so it\u2019s important to make sure that hard work isn\u2019t in vain! To ensure your messages function properly on all the devices your subscribers use to open them, consider using <a rel=\"noopener\" href=\"https:\/\/www.litmus.com\/email-testing\">rendering tools like Litmus<\/a>. Litmus tests your sends across on 100+ popular email clients and provides instant feedback so you know your emails looks great and will (hopefully!) have the desired impact once you hit send.<\/p>\n<p><strong>Link destination<\/strong><\/p>\n<p>Links in messages direct people to a destination, usually a webpage hosted at a web server. Stress-testing your server\u2019s capacity to handle multiple simultaneous requests is important. With <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.webhostingsecretrevealed.net\/blog\/web-tools\/load-testing-tools\/\" target=\"_blank\" rel=\"noopener\">the right tools,<\/a> you should be able to grow your hosting infrastructure according to user demand.<\/p>\n<h2>Why stress when you can test?<\/h2>\n<p>All in all, stress-testing your email program is like hitting the gym. It helps you identify the areas that need improvement and gives your program the strength to handle any and all challenges thrown its way. So, make stress-testing a priority this year, watch your email program flex its muscles, and achieve great results!<\/p>\n<p>One more tip before you go: an email program is only strong as its sender reputation. Could a poor reputation be tanking your deliverability and harming your email program? Check out our free cheat sheet, <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.validity.com\/resource-center\/top-5-ways-youre-ruining-your-sender-reputation\/\">Top 5 Ways You\u2019re Ruining Your Sender Reputation<\/a>, to find out.<\/p>\n<div class=\"cta-button\" style=\"text-align: center;\">\n<p style=\"text-align: left;\"><a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.validity.com\/resource-center\/top-5-ways-youre-ruining-your-sender-reputation\/\" target=\"https:\/\/www.validity.com\/resource-center\/top-5-ways-youre-ruining-your-sender-reputation\/\">Get the Cheat Sheet<\/a><\/p>\n<p style=\"text-align: left;\">\n<div class=\"container pt-3 pb-5 px-1\">\n\t<div class=\"row blog-cta-blue rounded-5 p-4\">\n\t\t<div class=\"mx-auto col-12\">\n\t\t\t<div class=\"row d-flex align-items-center\">\n\t\t\t<div class=\"col-lg-6 col-12\">\n\t\t\t\t<p class=\"bold fs-4\">Stop stressing about email deliverability<\/p>\n\t\t\t\t<p>Learn the key factors affecting email deliverability. Implement best practices to ensure your messages reach the inbox every time.<\/p>\n\t\t\t\t<button class=\"button-blue download\"><a href=\"https:\/\/www.litmus.com\/blog\/why-email-deliverability-matters\" class=\"text-white text-decoration-none\">Learn more<\/a><\/button>\n\t\t\t<\/div><!--col-6-->\n\t\t\t<div class=\"col-6 d-none d-lg-block\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.litmus.com\/wp-content\/uploads\/2024\/09\/download-blog-cta-09232024.svg\" width=\"221\" height=\"175\" alt=\"\">\n\t\t\t<\/div><!--col-6-->\n\t\t\t<\/div> <!--row-->\n\t\t<\/div><!--col-12-->\n\t<\/div><!--row-->\n<\/div><!--container-->\n\t\n\t\n\t\n\t\n<\/p>\n<p style=\"text-align: left;\"><em>This article was originally published on <a rel=\"noopener\" target=\"_blank\" href=\"https:\/\/www.validity.com\/\">Validity<\/a>. <\/em><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Stress-testing can help you identify parts of your email program that are working well\u2014and those that need to be improved. Get started here.<\/p>\n","protected":false},"author":56,"featured_media":123277,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"tags":[10421],"blog_category":[10308],"class_list":["post-40486","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-tips","blog_category-email-testing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Top Ways to Stress Test Your Email Program - Litmus<\/title>\n<meta name=\"description\" content=\"Stress-testing can help you identify parts of your email program that are working well\u2014and those that need to be improved. 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