Mailcatch.app is an email and SMTP testing tool for developers to catch, preview, and debug test emails safely without sending to real users.

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🚀 Overview

Mailcatch.app is a dedicated sandbox for testing emails via SMTP. Developers configure their apps to use Mailcatch's sandbox SMTP server (sandbox-smtp.mailcatch.app:2525), where test emails are captured in private inboxes for easy previewing, inspection, and organization.

This project solves the problem of accidentally sending test emails to production users, disorganized testing data across environments, and inefficient email debugging. It provides a secure, collaborative space to validate email content, headers, and rendering before going live.

It's built for developers, engineering teams, and marketers integrating email features. Why build it? As stated on the site: 'For developers, by developers'—to make email testing effortless with setup in under 5 minutes and a modern dashboard.

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✨ Key Features

• Individual testing environments: Dedicated inboxes per account, organized by project or environment (what it does and why it matters: prevents mix-ups, keeps data tidy)
• Deep email inspection: Preview HTML, view raw source, validate headers across clients (ensures emails render correctly everywhere)
• Universal SMTP integration: Works with any app/framework supporting SMTP, 20+ code samples (easy setup for any stack)
• Team collaboration: Share emails securely, whitelist recipients, manage access (facilitates reviews without exposing data)
• Optional: Proactive support from engineers, unlimited history on paid plans

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🛠 Tech Stack

• Frontend: Modern web dashboard (React-based UI inferred from design)
• Backend: Custom SMTP server handling
• Database: Not specified
• Auth: Custom (email/password sign-in)
• Hosting: Not publicly disclosed (likely cloud provider)

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👥 Who Is This For?

This project is useful for:

• Developers who want to safely test email sending in dev/staging
• Teams looking for organized, shareable email testing
• Indie makers building apps with transactional or marketing emails

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📸 Screenshots / Demo

• Live demo: https://mailcatch.app
• GitHub: https://github.com/mailcatch

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🔥 Project Status

• 🟡 Maintained

Last updated: 2026-03-24

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❓ FAQ

Is this project free?

Freemium — First 200 emails free, no credit card needed. Paid from $14.99/month for 5 inboxes, 5k emails, team features. (Explain briefly.)

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Is the source code available?

No — explain why: Proprietary SaaS by Felis Software, Ltd.

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Can I contribute?

Closed-source service; contribute via feedback, issues on GitHub org, or support tickets.

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📬 Contact & Links

• Website: https://mailcatch.app
• GitHub: https://github.com/mailcatch
• Twitter/X: https://x.com/mailcatch_app
• Email: Support through app (no public email)

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