Recent stats show email ROI is $36 for every $1 spent. Spoiler alert This isn’t true for everyone, especially those who neglect email testing tools.
Let’s say your marketing team emails 15,000 trial users who may want your product’s annual plan, which costs $504.
At a 30% open rate, you’ll have 4,500 potential customers. Unfortunately, because your team didn’t test the email, they discovered it didn’t optimally display for your Outlook clients.
If 10% of your trial users use Outlook, that means there’s email rendering issues for 450 people. Factor in a 30% conversion rate and that leaves you with 135 potential lost customers who never clicked your call to action (CTA). Put simply, you lost $68,040 (135 x $504) in potential revenue by not testing your email.
Avoiding unexpected rendering problems is one area where email testing tools shine. When you test your emails, you also prevent issues with grammar and spelling, broken email design, image display, and the dreaded spam trap which hampers email deliverability.
In this post, we’ve put together 19 email testing tools that keep email rendering challenges at bay, help your emails evade spam folders, and ultimately allow you to drive revenue for your business.
Here are the tools we’ll cover:
|Email testing tool||Type of tool||Key features||Pricing|
|Litmus||Email preview and spam testing||Pre-send spam testing, integration with 20+ apps, email, phone, and chat support, email preview of 100+ email clients, automated quality assurance and testing of email elements||$99-$199 per month for 1-5 full users|
|Mailtrap||Email preview and spam testing||Spam testing, access to Mailtrap API, detailed information about email headers, safe email testing with a fake SMTP server, priority support||Free-$299 per month|
|Email on Acid||Email preview and spam testing||Unlimited email previews, spam or deliverability checks, full content checking of links, images, and spelling, commenting access, email and chat support||$99-$599 per month for 1-10 users|
|Preview My Email||Email preview and spam testing||Advanced HTML editor, unlimited email previews, variable email spam and inbox testing, identification of spam issues||$25-$399 per month for 1-10 users|
|SendForensics||Email deliverability testing||Email client preview testing, live inbox placement testing, predictive deliverability score, DMARC compliance verification, blacklist and whitelist monitoring, email content analysis and optimization, infrastructure analysis and optimization, ISP reputation analysis||$49-$199 per month for 2-10 users|
|GlockApps||Email deliverability testing||Bounce analytics, Email spam tests, DMARC messages, Email template editor, IP reputation monitoring||$79-$129 per month for 1-5 users|
|ZeroBounce||Email address verification||Integrates with 40+ apps, unknown results are free, 24/7 customer support, IP address geolocation, inbox placement test, blacklist monitoring, 18 validation tools, multiple API keys, email server test||Pay-as-you-go or $39-$249 per month, 100 free monthly validations|
|Clearout||Email address verification||Gibberish check for identifying random email addresses, integrates with 100+ apps, duplicate email removal, greylisting verification, blacklist monitoring, spam trap detection, simple API||Pay-as-you-go or monthly pricing, 100 free monthly validations|
|NeverBounce||Email address verification||API access, custom list tagging, bulk list email cleaning, automated list cleaning, integrates with 80+ apps, real-time email validation||Pay-as-you-go or monthly pricing|
|Lemwarm by Lemlist||Email warm-up||Real people, no fake accounts, warms up any email domain, 25+ years domain age range, email deliverability booster||$25-$29/month|
|MailReach||Email warm-up||12,000+ real inboxes, email reputation monitoring, email monitoring dashboard, live blacklists and DNS checkups, email warm up for multiple email service providers||$25 per email account per month for one to five email accounts|
|Folderly||Email warm-up||AI-based email warmer, email deliverability audit, email placement test, SPF Generator||$49 per month|
|AutoWarmer by QuickMail||Email warm-up||Tracking of email opens and clicks, automated stop on reply, automated follow-ups, bounce detection, live notifications, A/B testing||Free-$79 per month and per inbox|
|VWO||A/B testing||Visual editor with HTML attributes and CSS modification support, API access (for enterprise users), report segmentation, multivariate testing, email split test||Pricing undisclosed, contact sales team|
|Optimizely||A/B testing||API access, win rate reporting, email split testing, collaboration within the Optimizely platform, knowledge base, technical, community, and academy support||Pricing undisclosed, contact sales team|
|Mailchimp A/B testing||A/B testing||A/B testing, multivariate testing, segmentation, integration with 200+ apps, knowledge base, email, live chat, and phone support||$13-$1000+/month depending on number of contacts|
|CoSchedule email subject line analyzer||Email subject line testing||Preview of subject line on desktop and mobile, analysis of words that can increase/decrease opens, subject line score||Free|
|Email Subject Line Grader||Email subject line testing||Provides recommendations to fix technical problems with subject line, scannability, length, readability, subject line sentiment, identifying spam words, and more||Free|
|Send Check It||Email subject line testing||Provides recommendations to fix technical problems with subject line, scannability, length, readability, subject line sentiment, identifying spam words, and more||Free|
With over 300,000 potential renderings for any given email, there’s a wide range of differences in how a message can appear on different email clients. The same applies to email on desktop and mobile devices. This is where email preview tools work their magic.
Luckily, you can also use these tools for spam tests and ensure your email lands in your recipient’s inbox. Here are some excellent email preview and spam testing tools worth checking out:
Litmus is one of the best email testing tools used by small to enterprise-level organizations.
With Litmus, you can preview your email’s appearance on 100+ popular email clients like Outlook, Apple Mail, Gmail App, Samsung Mail, etc. And with the Litmus Spam Testing feature, you can evaluate your email against spam filters and receive notifications if your email is blocklisted or if you incorrectly set up your DMARC record.
Email features of Litmus
Mailtrap’s email preview works by analyzing your HTML and CSS and listing all issues it finds. Unlike Litmus, you can’t generate a preview for each email client, but you can identify common red flags among popular clients like Gmail and Outlook.
Besides Mailtrap’s preview and spam testing functionalities, an excellent feature is the ability to conduct all email tests on a fake server, meaning the probability of unintentionally sending test emails to your email subscribers is zero.
Email features of Mailtrap
Email on Acid is a top email testing tool used by marketers, developers, and enterprise companies like Toyota, The New York Times, and IBM. With Email on Acid, you can preview your email’s appearance on 90+ email clients and devices.
Plus, Email on Acid tests your message against 23 popular spam filters. The outcome? You gain insights on deliverability issues and fix them before pressing your send button.
Features of Email on Acid
Email on Acid pricing
Designers, marketers, and developers use Preview My Email to assess their email appearance on over 54 clients. Preview My Email allows you to test emails by uploading your saved HTML code, copy-pasting your email, sending your email to a special Preview My Email inbox, or submitting your email via an API.
With Preview My Email, you can identify and fix spam issues as this tool checks your original IP against over 50 of the most common industry blacklists.
Features of Preview My Email
Pricing of Preview My Email
Writing great marketing emails that get opened, read, and acted on is one thing; ensuring the deliverability of the email is another. Before checking out the email deliverability tools, here’s a quick video on what you can do to make email delivery seamless.
SendForensics is an advanced email deliverability suite that uses multiple AI insights to gauge an email’s ability to reach your recipient’s inbox. This tool measures your email’s quality by evaluating it against global filtering-systems/ISPs, including human recipients.
Adding SendForensics to your email toolbox allows you to monitor your sending infrastructure, email content (including links), IPs, domains, and other things that can impact deliverability. As a bonus, this testing tool has email preview functionality.
Features of SendForensics
GlockApps is a comprehensive email deliverability solution that provides inbox insights, DMARC analytics, bounce tracker, IP reputation monitoring, and free spam testing.
Using GlockApps gives you access to uptime monitoring of your IP, website, SPF, DKIM, and DMARC records. Monitoring these helps secure your email reputation, maintain email health, and improve website conversions. On top of these, the free spam checker allows you to track your email’s destination (inbox, promotion, and spam folders) after you hit send. With this, you fix all deliverability challenges so you have an optimum conversion rate.
Sending emails to invalid addresses causes them to bounce back unopened. One reason for email bounce is invalid email addresses; and with increased bounce frequency comes increased hits to your reputation, making your future bulk emails appear like spam.
With these tools for verifying email addresses, you can permanently clean your list and nip this challenge in the bud.
ZeroBounce is one of the popular email verification tools that can validate your email list with a high-level of accuracy. Whether you want to clean a list of 100, 1,000, or 10,000 subscribers, this tool takes from seconds to some minutes to purge your list of invalid email addresses.
Besides email verification, ZeroBounce has intuitive email validation APIs that automate and assess the quality of your contacts at the point of capture. Also, ZeroBounce has functionalities for email deliverability tests and real-time blacklist monitoring.
Clearout is a great email verification tool with similar features like ZeroBounce. Like ZeroBounce, this tool stands out because it validates a subscriber’s email from the point of capture.
So whether you intend to capture emails via your website, exit pop-ups, woocommerce checkouts, surveys/polls, chatbots, and newsletters, with Clearout, you can verify emails before they make it to your list. This prunes your list of invalid subscribers from the get-go, limits the chances of hard bounces, and improves deliverability.
Also, Clearout cleans your list of email duplicates, has spam detection algorithms, and verifies if your recipient’s mailbox can accept new emails.
NeverBounce is another excellent email verification tool with features similar to Clearout.
This tool provides real-time email verification, and it analyzes and verifies small to large lists. The best part? You can automate list cleaning by connecting your email provider to NeverBounce, meaning your email list will always be accurate and you’ll have peak deliverability.
Features of NeverBounce
If you have a new email or one you haven’t used in a while, warm it.
Warming your email helps you establish a reputation for your IP and this prevents your email from landing in spam folders. While you can warm emails manually, an effective way to achieve similar results in less time is by using email warm-up tools. Here are some of them:
Lemwarm is one of the best email warm up tools that helps you wave goodbye to spam folders.
The tool operates by progressively sending and engaging with small amounts of personalized emails, depending on your email domain’s age. Best part? Rather than send and respond to emails using fake accounts, Lemwarm exchanges emails with its 20,000+ people from over 100 countries. The result? Your sender reputation is high and your emails reach your recipients’ primary inboxes.
Features of Lemwarm
This intelligent email warm up tool is great for incrementally sending and engaging with emails and placing those that land in spam and promotion folders in the primary inbox. Besides that, MailReach exchanges emails with multiple email service providers, keeping your reputation high with Gmail, Outlook, etc.
Plus, its intuitive dashboard gives insights on your warm up status, allowing you to know where emails from your campaigns will end up.
Nutshell Campaigns plugs directly into your CRM data, so you can create highly targeted audience segments, track the impact of your emails in real-time, and manage all your communications out of a single tool. Get started for free!
As a popular AI-based email warmer, Folderly identifies, solves, and maintains all issues related to email deliverability. With Folderly, you can easily set up, track, and monitor your email warm up progress.
Furthermore, Folderly provides other email marketing solutions like email deliverability audit, email placement test, and it has an SPF Generator.
AutoWarmer is another powerful email warming tool like the others on this list.
One of its perks is the availability of a free-forever plan. While the free plan is great if you’re on a budget, it also limits your access to only warming inboxes on Gmail/Outlook/SMTP. You’d need to upgrade to a paid plan to use functionalities like the warm up deliverability report.
Conducting A/B tests is an excellent way to assess the effectiveness of email elements like your subject line, body copy, personalization, CTA, and more.
A/B tests work by first deciding on one specific element to test, the number of versions to test, and your sample size. Done right, these A/B testing tools won’t only increase your open rate, but increase your conversions.
VWO is a popular A/B testing tool that global brands use to test not just emails, but also web pages, apps and products. This tool can A/B test any element of your email campaign and measure the performance of the best variant.
Although this tool has multivariate testing functionality for evaluating multiple elements at once, it’s an email marketing best practice to test one element at a time.
Optimizely is another excellent A/B testing tool for testing elements of your email. Like VWO, Optimizely does multivariate analysis and has a suite of digital experience tools for ecommerce, websites, content management, and marketing planning.
Features of Optimizely
Mailchimp is a well-known email marketing tool with A/B testing functionality. With Mailchimp, you can select the list segment for your campaign, pick the variable you want to test, set the percentage of recipients for the test, and determine the parameter for the winning variant.
Premium users also have access to multivariate testing for three variables and up to eight combinations.
An excellent subject line attracts a click, a weak subject line could get ignored, and an email recipient could trash a spammy subject line immediately. So as the first thing your subscribers see, it’s vital to evaluate your email subject line before hitting send. These tools help.
This is one of the best tools for assessing the quality of your email subject lines. Having this tool in your email arsenal allows you to gain insights on what can increase your open rate.
With CoSchedule email subject line tester, you’ll see the previews of your subject line on desktop and mobile, words that can increase and decrease opens, and a subject line score. The best part? This email subject line analyzer is a free tool.
Email Subject Line Grader is another free tool for evaluating subject lines. Like CoSchedule, this tool assigns a subject line score after assessing the word and character count, including word mixture and balance of your subject line.
Send Check It is a free email testing tool that ensures your subject line hits the mark.
After assessing your subject line, Send Check It provides recommendations on what to fix. These include technical problems with your subject line, scannability, length, readability, subject line sentiment, identifying spam words, and more..
After warming your email, testing your subject line, running A/B tests and whatnot, you’ll need a centralized location to send, track, and measure the results of your campaign.
👉Enter Nutshell. Nutshell CRM software integrates your marketing and sales data in one unified platform. This prevents you from juggling multiple software dashboards by providing the reports and communication tools you need in a single view.
Plus, Nutshell integrates with 45+ business apps, has email preview functionality through Nutshell Campaigns, allows you to test different versions of your email, and we don’t deliver bounced emails, meaning your deliverability remains intact and you maintain optimum email ROI.
In a nutshell, you should give Nutshell a shot 🤩.
Best part? You can try Nutshell free for 14 days.
No problem. To see if Nutshell is the right choice for your sales team, start a 14-day free trial today!
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