Open Source
Open Source
FreeCustom.Email is built entirely in the open. Both our frontend and backend are publicly available on GitHub — inspect every line, contribute, or self-host your own instance.
01 — Our Repositories
Two repositories. One complete, privacy-respecting temp mail stack — no private code hiding behind the curtain.
Backend · Maildrop
DishIs/fce-backend
The core engine powering FreeCustom.Email. A multi-service Node.js + TypeScript application that handles everything from receiving emails via a custom Haraka SMTP server to managing user accounts, real-time WebSocket updates, and API requests.
Stack
Node.js · TypeScript · Docker · Haraka SMTP · MongoDB · Redis · WebSockets
Highlights
High-performance smtp-fast engine
Microservices architecture
Docker Compose one-command deploy
Public REST API at /api/playground
Frontend · UI
DishIs/fce-frontend
The open-source Next.js frontend powering FreeCustom.Email's UI. Blazing fast, fully ad-free, and built to score near-perfect on PageSpeed. Plug it into our public API or your own self-hosted backend.
Stack
Next.js · TypeScript · Tailwind CSS · NextAuth.js · React
Highlights
95–100 PageSpeed score out of the box
Zero ads, zero trackers
Connect to public API or self-host
Fully customisable branding & themes
02 — How We Compare
Most temp mail services treat privacy as an afterthought — or worse, as a product to monetise. Here's how FreeCustom.Email stacks up against the most popular alternatives.
| Feature | FCE | Mailinator | Guerrilla | temp-mail |
|---|---|---|---|---|
Fully Open Source Both our frontend & backend are public on GitHub. | ||||
Zero Ads No ad networks, no tracking pixels for advertising. | ||||
No User Tracking We collect only aggregate, non-identifiable analytics. | ||||
No Data Selling We explicitly do not sell personal information (CCPA compliant). | ? | |||
Self-Hostable Deploy your own instance with Docker Compose. | ||||
Public REST API Available at freecustom.email/api and /api/playground. | ||||
Custom Inbox Names Pick your own inbox name, no random strings. | ||||
Real-Time Updates WebSocket-powered live inbox — no manual refresh. |
Competitor data is based on publicly available information and our best assessment at the time of writing. Features may change — always verify with each provider directly.
03 — Why We're Open Source
Radical Transparency
When we say we don't track you, sell your data, or show ads — you can verify it. Every claim in our privacy policy is backed by public code.
Community Trust
Open source builds real accountability. Security researchers, developers, and users can audit, flag issues, and contribute improvements.
Self-Hostable
Don't trust any third-party with your data? Run your own instance. Our Docker Compose setup makes it straightforward to deploy on your own infrastructure.
Want to contribute?
Bug reports, pull requests, and ideas are all welcome. Check the contributing guide in each repository to get started.