Description: SendCheckIt is a deceptively simple email subject line testing tool. All you need to do is enter your proposed subject line, and SendCheckIt will email you the test results. The report itself is very comprehensive, including things like reading grade level, scannability, sentiment analysis, and spam potential. 
 
Best used for: Enterprises or agencies that send large volumes of emails

Description: SendForensics is a top-tier email deliverability and security testing tool that helps enterprise marketers protect their email reputation. SendForensics allows marketers to test their emails for both delivery and engagement. Enterprise users can further use the tool to test network deliverability, counterfeit emails and DMARC compliance.
 

 
Free Trial: None Pro-tip: Don’t skip the testing phase whenever you run an email campaign. Instead, make room in your production schedule for as many tests as you can afford. It will increase your email’s chances of getting to your audience’s inbox, catching their attention, and converting. Your bottom line will thank you.  
Your email might get sent to spam for a number of reasons, and one of those is the sender’s reputation. These tools will check for any red flags that might cause your email to be rejected. 
 
Pricing: Free

Email Previewing and HTML Validation

Description: CoSchedule is a project management platform for marketers that released a free tool to analyze blog headlines. But this tool is so good that marketers are using it for more than just content–it’s also effective at analyzing email subject lines. The two formats share the same basic need: attract viewer attention. Try it yourself and see how well it works for you.
Description: Mailgun is an all-in-one email marketing tool that combines email sending, marketing and analytics functions into the same platform. Mailgun is notable for its strong validation and deliverability testing tools, which is why it’s on this list. In addition to the tools themselves, Mailgun also offers deliverability services to guide you and help you adopt more successful email marketing processes.
 

1. Litmus

Pricing: Pay per month
Best used for: Enterprise marketers

  • $99/mo – Litmus Basic
  • $199/mo – Litmus Plus
  • Custom – Litmus Enterprise

Best used for: Enterprise marketers

  • Free – $0
  • Individual – $9.99/mo
  • Team – $24.99/mo
  • Business – $49.99/mo
  • Premium – $99.99/mo
  • Enterprise – $299.99/mo
Read more5 Ways to Increase eCommerce Conversions

Best used for: Enterprise marketers

  • Flex – 5,000 emails a month free for 3 months, then $0.80/1000 emails
  • Foundation – $35/mo
  • Growth – $80/mo
  • Scale – $90/mo

Best used for: Enterprise marketers
Description: For those of you unfamiliar with the term, Schema.org email markups allow you to put calls to action like “RSVP” and “Complete purchase” right in your email’s subject line. The email recipient doesn’t even have to open the email to convert!  
Description: For those of you unfamiliar with the term, Schema.org email markups allow you to put calls to action like “RSVP” and “Complete purchase” right in your email’s subject line. The email recipient doesn’t even have to open the email to convert!  
Best used for: Anyone
Description: Mailtrap is a service that helps you reliably isolate test emails from production emails and completely eliminates the chance of a test email landing in an actual customer’s inbox. It works by associating each of your SMTP servers with a specific Mailtrap inbox. Once it’s in the Mailtrap inbox, you can perform whatever rendering or HTML validation tests you want. 
There are a lot of factors that affect an email campaign’s success; from deliverability to subject line to the quality of your email list. Because of that, there are many email testing tools available to choose from–each with their own specialties and characteristics. So we’ve assembled a list of the best options for each purpose.

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