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MailViewr lets developers, marketers, and email designers instantly preview HTML email templates across major clients including Gmail, Outlook, and mobile platforms—no sign-up or payment required. It simulates dark mode rendering using real client behaviour, helping you catch display issues before they reach subscribers.

Features include real-world client rendering previews, direct test email sending, saved template management, secure shareable preview links for collaboration, SpamAssassin-powered spam score checking, and detailed QA reports that identify layout breaks, spacing issues, image alignment problems, and responsiveness failures across clients and devices.

QA reports provide clear, actionable insights so you know exactly what to fix, while shareable links make it easy for teammates and clients to review and approve designs without creating an account. Built for teams that want to ship professional, consistent email campaigns faster and without expensive tooling.

MailViewr can be found in Marketing Automation Platforms, Email Marketing Software, Software Testing & Quality Assurance categories.

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MailViewr Main Features

• QA Report
  Get a structured breakdown of rendering issues across clients — layout breaks, spacing, image alignment, and responsiveness.
• Free Templates
  Use free email templates that are already designed for easy editing.
• Save Templates
  Save and manage your HTML email templates directly in your account for quick access and reuse.
• Shareable link
  Generate a shareable preview link for clients and teammates.
• Paste HTML Code
  Paste your email design code directly into the tool to test it.
• Preview and Fix
  Look at the preview, find issues, and fix layout or spacing problems.
• Send Test Emails
  Send a test email directly to your inbox to check the final look.
• Dark Mode Preview
  Preview your email in dark mode to see how it looks.
• Choose Email Client
  Select an email client or device to see how your email will look there.
• Compatibility Score
  Get a score that shows how compatible your email is across different email clients.
• Instant Email Preview
  See how your email looks instantly in different email clients and devices.
• Trusted by Developers
  600+ monthly visit from around the world use this tool to test emails.
• Multiple Template Types
  Choose from different templates like newsletter, promotional, welcome, transactional, or event invitation.
• Create Your Own Templates
  Make your own email templates suitable for newsletters, promotions, or invitations.
• SpamAssassin Spam Checker
  Run your email through SpamAssassin to get a spam score and fix deliverability issues before sending.

MailViewr Benefits

• Save Time on QA
  Eliminate back-and-forth testing cycles across multiple devices and clients by getting a full compatibility report in seconds.
• Dark Mode Confidence
  Preview exactly how your email renders in Gmail and Outlook dark mode so subscribers see what you intended, not broken colors and invisible text.
• Structured QA Reports
  Get a clear, actionable breakdown of what's broken and why — so developers and marketers know exactly what to fix without interpretation.
• Improve Deliverability
  Run emails through SpamAssassin spam scoring to fix deliverability risks before sending and keep your sender reputation clean.
• Faster Campaign Launches
  Cut the time between template completion and send-ready by removing manual device testing and guesswork from your workflow.
• Consistent Brand Experience
  Ensure your emails look professional and on-brand across Gmail, Outlook, and mobile clients regardless of how each client renders HTML.
• Catch Rendering Issues Early
  Identify layout breaks, spacing problems, image misalignment, and responsiveness failures before your email reaches a single subscriber.
• No Expensive Tooling Required
  Get professional-grade email testing for free — no enterprise contract, no per-seat pricing, no commitment.
• No Signup Barrier for Quick Tests
  Jump straight into previewing HTML without creating an account — reducing friction for developers and designers who just need a fast answer.
• Test Without Leaving Your Workflow
  Paste your HTML directly and get results instantly — no project setup, no onboarding, no tool switching mid-build.

Who should use MailViewr?

• QA Engineers
  QA professionals testing email output from automated systems who need structured compatibility and rendering reports.
• SaaS Founders
  Founders sending transactional and marketing emails who want to ensure professional rendering without expensive tooling.
• Email Designers
  Designers crafting email campaigns who want pixel-accurate previews without spinning up a full ESP test cycle.
• Growth Marketers
  Marketers running drip campaigns or product emails who want to reduce broken layout complaints from subscribers.
• Product Managers
  PMs reviewing email touchpoints in their product who need a quick visual check without developer involvement.
• Email Agency Teams
  Agency teams managing multiple client email campaigns who need fast, repeatable template testing across clients and devices.
• Frontend Developers
  Developers building or maintaining HTML email templates who need to catch rendering issues across clients before deploying.
• Full-Stack Developers
  Developers integrating transactional emails into products who need to verify template rendering across Gmail, Outlook, and mobile.
• Email Marketing Managers
  Marketing professionals overseeing campaign quality who need a fast sanity check on templates before scheduling sends.
• Freelance Web Developers
  Freelancers building email templates for clients who need a free, no-signup tool to validate work quickly.

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