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The 9 Best Email Testing Tools: Supercharge Your Email Campaigns

Are your email campaigns falling short of expectations? Are you unsure if your messages are even reaching their intended recipients?

With the right email testing tools, you can evaluate the deliverability of your emails across various providers, gaining valuable insights into how they are treated by different platforms. These tools empower you to identify and address any issues that may be hindering your inbox placement, ensuring that your messages land exactly where they should.

In this article, we’ll look at the nine best email testing tools that can revolutionize your email campaigns. From comprehensive deliverability reports to real-time monitoring and expert recommendations, these tools offer the ammunition you need to optimize your email marketing efforts. Below are some of the paid and free email testing tools you need to consider.

Note: Test your email deliverability by utilizing MailGenius, the leading tool. Reduce bounce rates, being categorized as spam, and ensure your emails easily reach the inbox. Send free test emails, gain valuable feedback, and enhance deliverability, engagement, and conversions. Optimize your email campaigns today. Send a free test now.

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MailGenius is an email testing platform designed to optimize email campaigns and ensure they reach their intended inboxes. It provides an in-depth analysis of how mailbox providers interpret your emails, helping you to optimize your campaigns for maximum deliverability.

The tool operates by examining each component of your emails to identify potential concerns for email service providers. The result? A email deliverability report highlighting the strengths, weaknesses, and areas for improvement in your email campaigns.

Key benefits of MailGenius include:

The tool identifies potential issues or words that may trigger spam filters, enabling users to adjust their campaigns accordingly.

MailGenius also offers a free SPF and DKIM checker. SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) are essential email authentication methods that prevent email spoofing. MailGenius automatically checks your SPF text record to ensure it’s set up correctly, and your emails are authorized.

Another feature of MailGenius is the blacklist testing for domain and server IPs. The tool tests your mail server IP address against over 100 DNS-based blacklists to see if your domain name or server IP is listed on any significant blacklists. This feature helps you maintain a positive sender reputation, which is vital for high deliverability rates.

MailGenius also assists in maintaining a positive sender reputation, which is crucial for high deliverability rates. It provides regular updates and recommendations to adapt to changing email deliverability trends, keeping you ahead of the curve.

MailGenius offers three free, complimentary inbox placement tests for new users. After these three tests, you can consider getting a paid subscription to continue improving your email deliverability. If you also own `10+ domains, the platform can provide you with bulk discounts to monitor your domains. This will allow you to save on the $99/year per domain that MailGenius charges.


  • Provides in-depth analysis of email deliverability, including spam issue identification, sender reputation management, and blacklist monitoring.

  • Offers immediate feedback on email deliverability with its testing feature.

  • Allows integration of MailGenius’s capabilities into your own applications and workflows.

  • Inbox Ignite improves domain reputation with opens and clicks from real users.

  • Provides round-the-clock monitoring of your email domain.

  • Email HTML testing 

Try A Test Email

In this section, we’ll go over step-by-step how to run an email deliverability test with our software at no cost.

Step 1: Visit MailGenius Website

Go to the MailGenius website. MailGenius is a free tool that helps you check your emails for issues that might lead to them being marked as spam. 

Step 2: Copy the Test Email Address

You’ll be provided with a unique email address. Copy this address as you’ll be sending your test email to it.

Step 3: Prepare Your Test Email

Open your email client or email service provider. Compose a new email that is representative of the emails you’ll be sending to your customers or subscribers. This includes the subject line, body content, images, links, and any attachments.

Step 4: Send Your Test Email

Paste the unique email address you copied from MailGenius into the “To” field of your email. Send the email.

MailGenius report

Step 5: Analyze the Results

Go back to the MailGenius website and click on “Check Your Score”. MailGenius will analyze your email and provide a report detailing any issues that might affect deliverability or cause your email to be marked as spam.

Step 6: Review and Implement Suggestions

Review the suggestions provided by MailGenius. These could be related to your email’s content, its metadata, your server configuration, or your domain’s reputation. Implement these suggestions to improve your email’s deliverability.

Step 7: Repeat the Test

After making the suggested changes, repeat the test by sending another email to the unique address provided by MailGenius. This will help you see if the changes you made have improved your score.

Remember, the goal of using MailGenius is to ensure your emails reach your recipients’ inboxes, not their spam folders. By following these steps, you’ll be well on your way to achieving better email deliverability.



Litmus is an email testing platform that empowers teams to build and test emails with ease. Its user-friendly interface requires minimal HTML skills, making it accessible to all. Litmus was one of the pioneers in implementing pre-send spam testing, ensuring your emails land in the inbox, not the spam folder.

Litmus allows you to reuse and save email modules across different campaigns, streamlining your workflow. It offers automated quality assurance and testing of email elements like broken links, alt text, and loading speed, eliminating manual checks. It also provides a host of personalization options, including the ability to integrate with over 20 apps for a seamless workflow.

Litmus provides users with the ability to preview their campaigns in over 100 email clients, ensuring your emails look great no matter where they’re viewed. It also offers a comprehensive view of your email, domain, and IP health, allowing you to track clicks, bounces, blacklists, and more.

Litmus can be integrated with popular email service providers and marketing platforms, providing users with versatility and flexibility. This allows you to create, test, and send your emails from one platform, saving you valuable time.

Litmus offers a range of pricing options to suit different needs. The Basic plan starts at $99 per month, the Plus plan at $199 per month, and the Enterprise plan, with pricing available upon request. All plans are billed annually.


  • Reduces email testing and QA time significantly with guided checks of critical email elements.

  • Instant previews in 100+ popular email clients, including Dark Mode.

  • Automated pre-send tests for links, images, tracking, and accessibility.

  • Scans emails against 25+ tests to ensure they reach the inbox, not the junk folder.

  • Allows testing wherever you build, reducing review cycles and saving time.

Email On Acid

Email on Acid

Email on Acid is a comprehensive email testing platform designed to streamline your email marketing process. It offers a suite of tools that require minimal technical skills, making it accessible to all users.

Email on Acid allows for unlimited email previews. So, you can view your emails as they would appear in various clients and devices before sending, ensuring your emails look their best across all platforms.

Email on Acid also offers spam or deliverability checks. If your emails are consistently marked as spam, your sender’s reputation could be damaged, which could affect your future email deliverability. With this feature, you can identify and resolve any issues that could trigger spam filters.

For collaborative teams, Email on Acid offers commenting access on email previews. Instead of sending emails back and forth or having meetings to discuss changes, team members can leave their feedback directly on the email preview. This can speed up the email design process and ensure everyone is on the same page.

Email on Acid offers a range of pricing options to suit different needs. The Basics plan starts at $99 per month for one user, the Premium plan at $179 per month for three users, and the Professional plan at $599 per month for 10 users. An Enterprise plan is also available at a custom price. All plans come with a seven-day free trial, allowing you to test the platform before committing.


  • Provides accurate email previews on various platforms.

  • Allows multiple tests to identify potential spam triggers.

  • Measures email deliverability and provides IP and domain reputation insights.

  • Validates SPF and DKIM records for email authentication.

  • Checks if your domain or IP is listed on any significant blacklists.

  • Ensures emails are optimized for dark mode viewing.

  • Enables sharing of test links and provides commenting functionality for team collaboration.



GlockApps is a powerful email testing and analytics platform that optimizes your email marketing campaigns. It offers an array of features designed to ensure your emails reach their intended destination.

Like other platforms on this list, GlockApps allows you to test your emails’ deliverability across various email clients and provides insights into where your emails are landing – in the inbox, spam folder, or elsewhere.

It also provides detailed analytics on bounced emails. By understanding why your emails are bouncing, whether it’s due to invalid email addresses, full inboxes, or server issues, you can maintain a clean email list and improve your sender reputation.

Another useful tool GlockApps offers is the domain check tool. This checks your domain against various blacklists. If your domain is blacklisted, your emails are more likely to be marked as spam. By maintaining a clean domain reputation, you can improve your email deliverability.

To help you create professional and engaging emails, GlockApps provides an email template editor. This feature allows you to create beautiful emails without any coding skills, saving you time and ensuring your emails look great across all devices and email clients.

GlockApps offers a range of pricing options to suit different needs. It has a Personal Free Plan for 3 email spam tests, 10,000 DMARC messages, as well as 10 uptime and Reputation Monitors for a 2 weeks trial. Then, pricing starts with the Basic Plan at $79/month and the Business at $129/month. A Custom Plan is also available.


  • Trusted by clients globally for improving email deliverability and reputation.

  • Provides comprehensive email deliverability testing.

  • Offers valuable tools like DMARC Analytics and BIMI Inspector.

  • Helps ensure emails reach customers’ inboxes, not spam folders.

  • Provides plenty of information to improve email deliverability and ROI.

  • Over 15 years of experience in developing email marketing software solutions.



Mailtrap is an innovative email testing software that ensures your emails are ready for delivery. It offers a range of features designed to optimize your email marketing campaigns, all performed on a fake server to ensure there’s no risk of accidentally sending test emails to your subscribers.

One of the standout features of Mailtrap is its capacity to handle a large volume of test emails per month, ranging from 500 to 10 million depending on your plan. This makes it a scalable solution that can grow with your business.

For those who need to dig deeper, Mailtrap also offers verification of multiple variables at a time, including email headers, body text, and subject lines. This comprehensive testing ensures every aspect of your email is optimized for deliverability and engagement.

Each account comes with an individual testing environment that you can integrate with your app in just a few clicks. Imagine having your testing environment ready in less than 5 minutes. 

The platform also helps you keep all your testing data organized in one place. You can create individual inboxes for different environments or review servers and group them into relevant projects. This way, you can keep your workflow clean and efficient.  Read this article on the best MailTrap alternative for email deliverability. 

And for developers and teams with more complex needs, Mailtrap provides access to its API. This allows you to integrate Mailtrap’s testing capabilities into your own applications and workflows.

Mailtrap offers a range of pricing options to suit different needs. It has a free plan for those who want to try out its features. For more advanced features, pricing starts at $9 per month for the Individual plan and goes up to $299 per month for the Enterprise plan. 


  • Quick Setup: Configure your testing environment in just a few minutes.

  • Data Organization: Keep all testing data organized in one place with individual inboxes for different environments.

  • Testing API: Quickly integrate with their well-documented API for automated testing.

  • A/B Testing Tool

  • Detailed Email Analysis: Inspect both the content and source of your emails, check spam scores, validate headers, and analyze HTML support across email clients.

  • Team Collaboration: Share test emails with your team and manage access to your inboxes.

  • Email Sending Service Testing: Test your email sending service by sending emails to Mailtrap Email Testing account directly from your CRM or email sending service.

Send Forensics


SendForensics is an email deliverability platform that provides a suite of tools to ensure your emails reach the inbox. It’s designed to help you spend less time troubleshooting email deliverability and more time sending emails that drive revenue.

Its email client preview testing feature allows you to see how your emails will appear in various email clients before sending, ensuring a consistent and professional look across all platforms.

The platform provides a predictive deliverability score, giving you a forecast of your email’s likelihood of reaching the inbox. This allows you to make necessary adjustments before sending, optimizing your email for deliverability.

SendForensics also offers DMARC compliance verification. This feature helps protect your domain from email spoofing, building trust with your subscribers and maintaining a good sender reputation.

With its blacklist and whitelist monitoring, SendForensics keeps an eye on your IP or domain status, ensuring your emails are welcomed by Internet Service Providers (ISPs).

The platform also provides email content analysis and optimization, infrastructure analysis and optimization, and ISP reputation analysis. These features ensure every aspect of your email, from the content to the sending infrastructure, is optimized for performance and deliverability.

SendForensics can be integrated with Google Postmaster Tools, Microsoft SNDS, and 20+ ESPs, providing users with versatility and flexibility. This allows you to connect and consolidate data from multiple sources.

SendForensics offers a range of pricing options to suit different needs. The Starter plan starts at $29 per month, the Professional plan at $99 per month, and the Enterprise plan, with pricing available upon request. All plans are billed annually.


  • Provides machine learning-powered spam tests to identify potential spam triggers.

  • Offers a comprehensive view of email, domain, and IP health metrics.

  • Gives a holistic view of the sender’s reputation and email performance.

  • Integrates with various tools and ESPs for data consolidation.

  • Monitors deliverability and reputation signals around the clock.

  • Helps in preventing domain impersonation and defending the sender’s reputation.

  • Assists in achieving DMARC compliance swiftly.

  • Identifies subdomains and secures non-sending domains.

  • Enables detailed investigations into IP events and authentication results.



NeverBounce is a trusted email verification platform with a user base of over 125,000. It offers an analysis report on emails of any size. Whether you’re sending a single email or a bulk list, NeverBounce can provide valuable insights into your email performance.

Its Instant Bounce Analysis feature provides immediate feedback on the deliverability of your emails, allowing you to make necessary adjustments before sending.

The email testing software also offers API access. This allows you to integrate NeverBounce’s email verification capabilities into your own applications and workflows, automating the verification process and saving you time.

NeverBounce offers a pay-as-you-go plan, allowing you to pay only for the emails you verify. Pricing starts at $0.008 per email for up to 10,000 emails and decreases as the volume increases, going down to $0.003 per email for up to 1,000,000 emails. For larger volumes or more advanced features, NeverBounce offers an Enterprise plan, with pricing available upon request.


  • Provides email verification for any size of an email list.

  • Offers immediate deliverability feedback with Instant Bounce Analysis.

  • Allows API integration for automated email verification.

  • Features a pay-as-you-go plan with volume-based pricing.

  • Offers an Enterprise plan for larger volumes and advanced features.

Mail Reach


MailReach is a robust email deliverability platform trusted by over 3,000 growing businesses worldwide. It ensures your emails land in the inbox, not the spam folder, by initiating natural conversations with thousands of high-reputation inboxes. The warm-up emails are human-like and sensible, building trust and enhancing your email reputation.

MailReach provides a complete and user-friendly dashboard to follow your results and the health of your sending addresses. You can see your sender score, where your warm-up emails landed on the major inbox providers, how many were saved from spam, and more. It also checks if your DNS records have been properly set up, if your domain is listed on a blacklist, and more.

The platform is compatible with various email technologies, including Gmail/G Suite, Outlook/Office365, SendGrid, MailGun, and Custom SMTP. This compatibility ensures that no matter what email service you use, you can benefit from MailReach’s features.

Pricing is flexible to suit different needs. The Starter plan starts at $25 per email account per month for one to five email accounts. The Scale plan starts at $19.50 per email account per month for over six email accounts, with the pricing reducing as you add more email accounts to warm.


  • Manages and improves the sender reputation.

  • Identifies and resolves spam issues.

  • Aims to enhance email engagement rates.

  • Automates email conversations with high-reputation inboxes.

  • Ensures positive interactions for a reputation boost.

  • Provides a comprehensive dashboard for monitoring.

  • Compatible with various email technologies.



Folderly offers a one-stop-shop solution that covers all aspects of email deliverability. You can boost your inbox rate, analyze email content, and maintain mailbox health – all in one platform.

Folderly’s standout feature is its automatically generated senders. This feature creates unique sender profiles for your email campaigns, enhancing your sender reputation and improving email deliverability.

The platform also leverages GPT-3 powered interactions. This advanced AI technology ensures your emails are engaging and human-like, increasing the likelihood of positive engagement and improving your email performance.

Folderly also offers an Email Templates Dashboard. With this feature, you can effortlessly create and manage custom email templates, and analyze them for potential spam triggers and other issues that might negatively impact your delivery rates.

Folderly offers a straightforward pricing model for its email warm-up feature at $49 per month. This makes it an affordable solution for businesses of all sizes looking to improve their email deliverability.


  • Provides a comprehensive solution for email deliverability.

  • Offers visibility into email placement across different folders.

  • Manages sender reputation through positive email interactions.

  • Allows creation and analysis of custom email templates.

  • Assists with DNS and authentication setup.

  • Monitors domain and IP for deliverability issues.

  • Compatible with various email technologies.

Bonus Tool: TestSubject

TestSubject is a free email testing tool designed to help email marketers optimize their email subject lines and sender names for mobile devices.

Developed by ZURB, a product design company, TestSubject provides instant previews of how your email subject line, sender names, and pre-header text will appear on popular mobile devices and email clients. This allows you to tailor your email content to ensure it is displayed correctly and effectively, regardless of the device or email client your recipient is using.

The free tool is incredibly easy to use. Simply copy and paste your text into the relevant fields, and TestSubject will generate previews for devices such as the iPhone 6, iPhone 6 Plus, and Samsung Galaxy Note 5.

An alternative to TestSubject you can consider is Email Subject Line Grader. This free platform assigns a score to your subject lines after evaluating your word and character count.

Final Thoughts

Gone are the days of uncertainty and guesswork. With email testing tools, you can confidently navigate the intricacies of inbox placement, overcome potential obstacles, and reach your audience with precision. By leveraging these powerful tools, you gain a competitive edge and set the stage for remarkable email campaign success.

Hopefully, by reading this article, you’ll be able to choose the best email testing tool for your email needs.