Email HTML Stripped by Email Clients
You designed beautiful HTML emails for your Replit app, but when recipients open them, the formatting is completely wrong. Images are missing, layouts are broken, CSS styles are stripped, and in some cases the email appears as plain text with raw HTML tags visible.
Email clients (Gmail, Outlook, Apple Mail, Yahoo) are notoriously aggressive about stripping HTML and CSS that they consider unsafe. Unlike web browsers, email clients do not support modern CSS, JavaScript, or many standard HTML features. Each client strips different things in different ways.
AI-generated email templates almost always use modern web CSS (flexbox, grid, external stylesheets, CSS variables) that email clients will strip or ignore entirely, leaving your carefully designed emails looking broken.
Error Messages You Might See
Common Causes
- External CSS stylesheets — email clients strip <link> tags and only support inline styles
- Modern CSS features — flexbox, grid, CSS variables, and media queries are not supported by most email clients
- JavaScript in emails — all JavaScript is stripped by every email client
- Background images via CSS — many clients ignore CSS background-image properties
- Unsupported HTML tags — email clients strip <div> positioning in favor of table-based layouts
- Image hosting issues — images linked from localhost or Replit dev URLs are not accessible from email clients
How to Fix It
- Use inline CSS only — put all styles in style="" attributes directly on HTML elements, never in <style> tags or external files
- Use table-based layouts — email HTML requires <table> elements for layout, not div/flexbox/grid
- Use an email framework — libraries like MJML, React Email, or Maizzle generate email-safe HTML from modern syntax
- Host images externally — use Cloudinary, S3, or your CDN for email images with absolute HTTPS URLs
- Test across clients — use Litmus or Email on Acid to preview your emails in Gmail, Outlook, Apple Mail, and Yahoo
- Include a plain text fallback — always send a multipart email with both HTML and plain text versions
Real developers can help you.
Krishna Sai Kuncha
Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
Omar Faruk
As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture.
I played a key role in creating a scalable and maintainable platform to support educators and learners globally.
I'm enthusiastic about embracing new challenges and making meaningful contributions.
Victor Denisov
Developer
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
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Get HelpFrequently Asked Questions
Why does my email look fine in Gmail but broken in Outlook?
Outlook uses Microsoft Word's rendering engine for HTML emails, which has extremely limited CSS support. You must use table-based layouts and inline styles for Outlook compatibility.
Can I use CSS flexbox in emails?
No. Flexbox, grid, and most modern CSS features are not supported by major email clients. Use HTML tables for layout and inline styles for formatting.
What is the easiest way to create email-safe HTML?
Use MJML (mjml.io) — it lets you write simple markup that compiles to email-safe HTML with table layouts and inline styles automatically.