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Notification Emails Contain Broken Links in Bolt App
Users receive notification emails from your Bolt.new application (order confirmations, status updates, invitation links), but when they click the links, they land on 404 pages, localhost URLs, or completely wrong pages. The emails are being delivered but every link inside them is broken.
This destroys user trust immediately. A customer who receives an order confirmation with a broken tracking link, or a team member who gets an invitation email that leads to a 404, will question whether your entire application is legitimate. Broken email links are one of the most visible and damaging bugs.
The root cause is almost always that the URLs in email templates are hardcoded to your development environment or constructed incorrectly. Email templates are generated once and don't automatically update when your app URL changes from development to production.
Error Messages You Might See
404 Not Found: The page you're looking for doesn't exist
ERR_CONNECTION_REFUSED (linking to localhost)
This site can't be reached: localhost refused to connect
Invalid URL: undefined/orders/123
Common Causes
- Hardcoded localhost URLs — Email templates contain links like http://localhost:3000/orders/123 instead of using the production domain
- Missing base URL environment variable — No APP_URL or NEXT_PUBLIC_SITE_URL configured, so link generation defaults to localhost
- Dynamic route segments wrong — Links to /orders/[id] are rendered literally as /orders/[id] instead of /orders/abc123 with the actual ID
- URL encoding issues — Special characters in query parameters or paths are not properly encoded, breaking the link
- Trailing slash mismatch — Links include or exclude trailing slashes inconsistently, causing routing failures on the frontend
How to Fix It
- Set a base URL environment variable — Define APP_URL=https://yourapp.com in your environment and use it for all email link generation: const link = `${process.env.APP_URL}/orders/${orderId}`
- Create an email URL helper — Build a utility function: function emailUrl(path: string) { return new URL(path, process.env.APP_URL).toString(); } and use it everywhere in email templates
- Test emails with real link clicking — Don't just check that emails arrive - click every single link in your test emails to verify they resolve correctly
- Use absolute URLs always — Never use relative paths in emails (/orders/123). Always use full absolute URLs (https://yourapp.com/orders/123)
- Add link tracking — Use UTM parameters on email links so you can track click-through rates and quickly identify which links are broken
Real developers can help you.
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.
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
ISHANTDEEP SINGH
Senior Software Engineer with 7+ years of experience in React, JavaScript, TypeScript, Next.js, and Node.js. I’ve also worked as a tech lead for startups, owning end-to-end technical execution including architecture, development, scaling, and delivery. I bring a strong mix of hands-on coding, product thinking, and technical leadership, and I’m comfortable building products from scratch as well as improving and scaling existing systems.
BurnHavoc
Been around fixing other peoples code for 20 years.
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
Vlad Temian
15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox).
Cursor ambassador and agentic tooling builder.
I've scaled systems, automated deployments, and built observability tools for AI coding workflows. I specialize in taking vibe-coded apps from broken prototype to production-ready: fixing Supabase auth/RLS, Stripe integrations, deployment pipelines, and cleaning up AI-generated spaghetti.
I build tools in this space (agentprobe, claudebin, micode) and understand both sides: how AI generates code and why it breaks.
https://blog.vtemian.com/
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization.
I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
hanson1014
Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How do I make email links work in both development and production?
Use an environment variable for your base URL (APP_URL=http://localhost:3000 in dev, APP_URL=https://yourapp.com in production). Build all email links using this variable instead of hardcoding any domain.
How can I preview email templates before sending?
Create a preview route like /api/email-preview/order-confirmation that renders the email HTML in the browser. This lets you check formatting, links, and dynamic content without actually sending emails.