This article was published 5 years ago, therefore the contents of this post may be out of date.

If you’re sending emails campaigns, it’s necessary that you test them with email testing tools and applications. Without a doubt, you put a lot of time into writing copy and tweaking your email template. But sending your emails campaigns without proper testing can leave you open to mistakes, such like your emails not displaying correctly in some email clients, or the emails landing in spam boxes, or the awkward formatting in your email design.

There are plenty of useful tools and apps that can help you with testing your reputation, deliver-ability, design of your email template and even the quality of your subject lines and content.

Today here is a list of 15 tools and applications that will help to ensure the success of your email campaigns.

Email Previewing Tools

1. Litmus


Litmus is a comprehensive testing tool. Litmus lets you Litmus test all your emails and ensure they are compatible across multiple (90+) email clients before they are sent out. The tool also allows checking image off view, mobile previews and much more.

Price: Free 7 day trial then $79.00 per month for basic

2. Mailtrap


Mailtrap is a test mail server solution that allows testing email notifications without sending them to the real users of your application. Not only does Mailtrap work as a powerful email test tool, it also lets you view your dummy emails online, forward them to your regular mailbox, share with the team and more!

Price: Free to $299.99 per month

3. Email on Acid

Email On Acid

Email on Acid have gained a robust reputation in email testing communities, as it offers preview testing on 70 different clients on devices. The more configurations you’re able to test your email on, the less likely it is your email will appear broken to any given user.

Price: From $44.00 per month

4. HTML Email Check

Html Email Check And Validation Tool

HTML Email Check is a tool for validating the markup (HTML, XHTML, CSS) of your emails and newsletters. This handy tool also checks images, validates links, and checks for accessibility.

Price: Free to $14.95 per month

Sender Reputation Testing Tools

5. SenderScore

Sender Score

SenderScore focuses essentially on checking your reputation as the sender. All you have to do is type in your domain or your IP address and you’ll get a report on just how trustworthy you are as a sender of emails.

Seeing the full report and analytics does require registration, but this tool is certainly worth it to see if your email sending domain is seen as trustworthy.

6. Postmark

Postmark App Spam Checker

This is great tool if you don’t want to send your email to a tester link, you can always use the this tool. With this tool, you simply copy and paste your email code into the tool’s easy-to-use interface.

This copy and paste feature makes it easy to check different variations of your email for spam scores. Postmark is a straightforward tool for getting that score and improving your email.

7. Mail Tester

Mail Tester

This easy to use tool which is excellent for checking your email for spam-related red flags. This tool will examine your email for SPF and DKIM records, any keywords that might indicate spam to algorithms and various other metrics.

It will also take a look to see whether or not you are blacklisted by major email clients and all you have to do to get started is send an email to the tester link.

Subscriber Verification Tools

8. Email List Verify

Email List Verify

Email List Verify is an email list verification tool that cleans your email lists from spam traps, unverified emails and the hard bounces associated with such emails. You all know that we all have a sender reputation associated with our sender IP, once a hard bounce happens more than a few times, it influences our sender reputation. When this happens, best case scenario: your email won’t arrive to the inbox, worst case scenario: email service providers will black list your IP or domain, and that’s not good for business.

Price: From $4.00 per 1,000 emails

9. BriteVerify


A fake email is not just a lost opportunity, it’s a financial liability. The minimum value of an email to any company is $10, and at least 15% of all email addresses collected are invalid. Unverified emails do more than take up space: they also incur storage costs with CRM solutions, Databases, and Marketing Platforms, which ends up costing companies billions of dollars each year.

Unverified emails can have consequences beyond wasted spending. It leads to poor inbox deliverability and low Sender reputation.

That BriteVerify Email Verification is here to ensures that an email address actually exists in real-time without ever sending a message.

Price: 1 cent per verification

10. DataValidation

Data Validation

DataValidation guarantees that 99% of your emails will be delivered after using their email list cleaning service. To use this service, you upload or import your email list and then DataValidation starts analysing your list. When it’s complete, you’ll get a quality report that offers a breakdown of your list’s grades to help you determine when to verify your list.

And this tool also provides a comprehensive API for bulk and real-time email verification.

Price: Monitor up to 100,000 emails for free! to $19.99 for up to 500,000 emails monitored

11. Never Bounce

Never Bounce

NeverBounce will analyse and verify any size email list, providing you with validation results so you can see for yourself how clean your list is. This tool also offers advanced email list cleaning and scrubbing services.

Price: $0.008 price per email

Subject Line Testing Tools

12. CoSchedule’s Headline Analyzer

Co Schedule Free Headline Analyzer

The Headline Analyzer that will score your overall headline quality and rate its ability to result in social shares, increased traffic, and SEO value.

Price: Free

13. Zurb Test Subject

Test Subject

Most people decide to open an email based on two factors, the sender name and the subject line. Mobile email clients and devices often truncate subject lines and sender names, leading to sometimes hilarious but frequently disastrous results:

TestSubject is a simple tool for testing how your email subject line and sender name look on the most popular mobile devices and email clients*. Just copy and paste your text and you’ll get instant previews. Test before you send for more peace of mind.

Price: Free

Grammar Check

14. Hemingway Editor

Hemingway App

Hemingway helps improve the readability of your emails. It’s really useful when editing the body of your emails. It will grade your copy and suggest improvements.

Price: Free

15. Grammarly


Many tools let you proofread your text, but Grammarly is probably the best tool for checking your email content as it checks the content from various points of view. But it also pinpoints obvious spelling and punctuation errors, but it also offers vocabulary enhancement and plagiarism detection, thereby optimising and improving content.

Price: Free to $11.66 per month for the premium Grammarly app


15 Incredible Tools and Apps for Email Campaigns