10 Beste E-Mail-Testtools für optimierte Zustellung im Jahr 2026

Investigate is a free DMARC checker developed by Red Sift that helps organizations verify whether their email authentication protocols are configured correctly. Unlike simple DNS lookups, Investigate performs dynamic checks by requiring you to send a test email. This approach ensures that the tool evaluates your actual sending infrastructure—whether you use Gmail, Outlook, Salesforce, or another provider—rather than relying on static records alone.

Investigate offers comprehensive coverage by testing multiple authentication and security protocols, including SPF, DKIM, DMARC, BIMI, TLS, FCrDNS, and MTA-STS. If it detects misconfigurations or weaknesses, the tool provides clear, actionable guidance to help teams fix the issues quickly. This ensures stronger protection against phishing and business email compromise (BEC) attacks while supporting compliance with Microsoft, Google, and Yahoo’s bulk sender requirements.

Investigate provides valuable features for email security readiness, such as verifying DKIM/SPF alignment, checking if TLS is enabled for secure delivery, and validating DKIM keys. It also functions as a “security scorecard,” giving organizations a clear view of their domain’s trust posture and helping them achieve full DMARC enforcement faster.

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.

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.

Reflect is an AI-powered automated regression testing platform that boosts test coverage without impeding development, enabling effortless creation of comprehensive end-to-end tests without the need for manual code writing. They have email testing as an add-on to their mid-tier plan or you can sign up for the enterprise edition to for a feature-all-inclusive approach. Reflect also supports cross-browser testing—running tests on the most popular modern browsers: Chrome, Firefox, Edge, and Safari. They also regularly update their infrastructure as new browser versions are released. 

You can uncover bugs that often go unnoticed using their advanced visual testing capabilities. Unlike typical website automation software that operates below the user interaction level, Reflect comes equipped with first-class visual testing support. Detect and resolve visual regressions, such as UI bugs that don't impact email functionality, before they reach your end users. You can easily set up and run tests with Reflect's built-in scheduler. Create a test structure once and then relaunch it and record results at-will. Reflect also seamlessly integrates with any on-prem or cloud-hosted CI/CD platform, including popular ones like Jenkins and CircleCI.

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.

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.

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).

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.

MailTester is a cloud-based email verification solution that helps businesses verify the domains and syntax of emails. The tool is an effective first line of defense for email testing and provides an easy to use user interface, allowing accessibility to users lacking technical knowledge.

MailTester offers an extensive toolbox which includes Spam Trap Removal (searches for spam trap emails in your email lists) and Syntax Verifier (catches emails containing invalid syntaxes and deletes them). MailTester allows manual as well as automatic email verification using API and allows you to download segmented results.

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.