10 Best Email Testing Tools For Optimized Delivery [2023]

Stripo is an email design platform that allows teams to design responsive emails with little or no HTML skills required. It is equipped with a comprehensive drag-n-drop editor and a set of basic blocks that allow users to create real-time content with no coding skills. Stripo was one of the first email builders to implement AMP for Email technology.Stripo allows you to reuse and save email modules, even across different email campaigns. It comes with automated processes, custom modules libraries, and provides a host of personalization like the ability to embed custom HTML code to create interactive elements.It provides users with over 1000 free and ready-to-use responsive email templates that are also mobile optimized. Stripo comes with over 100,000 stock images along with the opportunity to personalize and export emails, then track conversions thereafter.Stripo can be integrated with over 60 ESPs/CRMs tools. This provides users with versatility and flexibility of functionality, for instance, to push emails to automation systems with only a click of a button.Stripo has a lifetime free version. The other versions are billed annually: Basic ($150 or $12.5 per month), Medium ($450 or $37.5 per month), Pro ($950 or $79 per month), and Prime, with pricing available upon request.

Sendinblue is an email and marketing automation tool designed specifically for small to medium enterprises. Sendinblue boasts a full, easy-to-use marketing hub, including automation features, email validation, reporting and email design templates. Sendinblue’s email automation tool lets you send rules and execute commands depending on end user action.

Sendinblue provides targeted communication using behavioural, email and contact data, helping you to build basic and advanced workflows and separate your contacts and email list based on website activity. Their jack-of-all-trades approach to email creation, marketing, automation, and testing is something that many SMEs prefer over juggling an endless email tech stack.

The cost of Sendinblue starts at $25/month for up to 20,000 emails. Sendinblue also offers a free version with some account limitations

Email on Acid is an email platform that specializes in quality assurance and pre-deployment functionality. It enhances organizations’ ability to deliver error-free emails that maintain brand reputation to ultimately boost marketing ROI. Email on Acid strives to provide consistency in visual email rendering across different devices and platforms, ensuring generated emails get displayed as intended. It streamlines the email testing and pre-deployment process with campaign prechecks, URL validation, image optimization, and so on. Email on Acid allows you to run checklists that matter like UTM validation and ADA compliance.Email on Acid improves email deliverability rates with spam checks in addition to providing access to blacklisted domains. This allows developers and email designers to verify their email list against up to over 20 popular spam filters while also testing IP addresses against popular block list services.Email on Acid comes with an editor for building templates along with team collaboration tools for better efficiency. Email on Acid has four pricing tiers, each with a free trial period and billed annually. The Basics is $74/month, Premium is $134/month, Professional costs $449/month, while the Enterprise tier is custom priced.

Mailchimp is an all-in-one marketing platform with a robust content creation suite, marketing analytics, and add-on options for advanced email testing features. Mailchimp is AI-powered and provides user-friendly tools on an intuitive user interface, offering accessibility to users who lack deep technical knowledge. Mailchimp offers comprehensive reporting for deliverability, open rates, click-throughs, and conversions.

Mailchimp provides marketing automation features so you can manage transactional deliveries and automate tasks and communications. The tool is scalable, allowing you to send a large quantity of emails at once. Mailchimp also offers website hosting and design, making it easy for the user to create landing pages from a variety of basic templates (or code your own from scratch).

To get access to the Transactional Email add-on, you’ll need a Standard Mailchimp plan or above: $14.99/month. Then, add $20/block (AKA 25,000 emails)—or, access lower per-block rates for bulk purchases.

MailHog is an email testing tool with a fake SMTP server that is designed specifically for app developers. The tool allows you to configure your application to use MailHog for SMTP delivery, view messages in a web UI, or retrieve them with the JSON API, and optionally release messages to real SMTP servers for delivery.

MailHog is a lightweight tool that you do not have to install, therefore it can be run on multiple

operating systems, including Windows, Linux and MacOS. This allows easy access for developers to test web app’s email sending and receiving capabilities. MailHog also provides real-time updates using an EventSource web interface. Captured emails can be stored in in-memory message storage and persisted in a MongoDB database and file-based stored system.

MailHog is an open source and free tool that can be used by anyone.

Litmus ESP is an email marketing tool that helps you build, test, and analyze all email service providers (ESPs). Litmus allows you to chart the specific reasons why an email may fail to deliver, as well as allow you to see the time taken to load an image and have accessibility to real world processing into inboxes.

Litmus’s user interface provides fast loading screenshots of all current email clients, organization of emails within one folder system, preview testing of email content and a Builder for checking and testing various code against different email clients, allowing you to streamline your processes. The user interface also allows for team commenting and editor functionality.

Litmus connects with a wide range of ESPs and other services, including Acoustic Campaign, Adobe Campaign Standard, Adobe Marketo, Hubspot, Oracle Eloqua, Oracle Responsys, Pardot, Salesforce Marketing Cloud, and SAP Marketing Cloud.

The cost for Litmus ESP starts at $79/month for the basic package. The tool also offers a 7-day free trial.

MailCatcher is an email testing tool that is designed to intercept all mail from any web or mobile

app and store it for display. MailCatcher runs a fake SMTP server and shows HTML and CSS emails, Plain Text emails and Source versions of messages as applicable. It also rewrites HTML enabling display of embedded images and can open links in a new window. This allows you to effectively test all aspects of your email and check the formatting before it goes to your client.

MailCatcher mail appears instantly if WebSockets is supported on your browser, otherwise it

updates every thirty seconds. It also offers command line options to override the default

SMTP/HTTP IP and port settings, which allows you to manipulate your testing the best way for

your practice.

MailCatcher is a free email testing tool and instructions on how to download it can be found on their site.

GlockApps is an inbox delivery and spam filter testing tool that allows users to fix any email deliverability problems prior to hitting send. GlockApps provides a one-stop-shop for all email delivery tools including a “Reputation Check,” which allows you to audit your IP address and domain you are sending from against industry blacklists. You also have access to DMARC Email Analytics to monitor, capture, separate and or/reject any email pretending to be you.

Glockapps provides detailed spam and blacklist reports in order to allow the user to troubleshoot and fix problems that improve email deliverability. This feature is particularly useful should you wish to test marketing campaigns and deliverability of email marketing providers. The report shows all IP addresses that were used to send emails and details whether they are on any blacklists, allowing you to get an overall view of the email campaign’s performance.

GlockApps costs from $59/month for the basic plan, and also provides a free version specifically for personal use.

MailTrap is an online tool for safe email testing in development and staging environments. The tool is used as a fake SMTP server to catch test emails, view them in virtual inboxes, and debug before they are sent to real users. MailTrap allows you to test and iterate over new emails efficiently in order to avoid emails mistakenly being sent to clients and other employees from dev environments. MailTrap can be integrated via API or as an SMTP server.

MailTrap offers numerous features, including Bcc testing. Most email testing tools do not support Bcc as it is not a regular SMTP header like To or Cc. MailTrap displays all Bcc’ed addresses and is able to verify whether they stay invisible for the main recipients. MailTrap also provides a customizable email address for each inbox, allowing you to run tests in a production environment in addition to a development environment.

The cost of MailTrap starts at $9.99/ month for 1 user and up to 5 inboxes. MailTrap also offers a free version specifically for a single inbox and up to 500 email tests per month.

Wormly is a website uptime monitoring solution that tracks things like site uptime, CPU usage, and SMTP server testing for new mail servers. You can access SMTP testing and Remote Ping testing for free through their site by adding a few details into an on-page form. Wormly provides detailed website and app uptime reporting and runs on all major operating systems including Windows and Linux.

In addition to email testing, Wormly offers a website monitoring service which continually monitors your website infrastructure and will alert you if a failure is detected, allowing you to act quickly and minimize downtime. The tool also offers sensors to monitor TCP/IP services to their full extent which allows you to get a picture of your infrastructure availability and uptime.

Wormly costs from $39/month for 10 test targets at 1-min frequency (1 user). They offer some free services on their website. Paid plans come with a free trial.