Mailinator
Disposable email testing inboxes with public and private domains
Open-Source Projects
Discover top open-source software, updated regularly with real-world adoption signals.
Discover top open-source software, updated regularly with real-world adoption signals.
Disposable email testing server with zero external dependencies
Self-contained email testing service that accepts messages for any address and exposes them via web, REST, and POP3 interfaces—no database required.
Inbucket is a production-ready email testing service designed for developers who need to capture, inspect, and validate outbound email during development and integration testing. Unlike traditional mail servers, Inbucket accepts messages for any email address without configuration, making it ideal for automated testing pipelines and local development environments.
Built in Go with an Elm-based web interface, Inbucket bundles SMTP, POP3, HTTP servers, and storage into a single binary. No external databases, message queues, or services are required—simply launch the executable or Docker container and start testing. Messages are accessible through a modern web UI, RESTful API with an official Go client, or standard POP3 connections.
Inbucket runs on Linux, macOS, and Windows with minimal resource requirements. Deploy via Docker for containerized environments, build from source for custom integrations, or configure through environment variables for cloud-native deployments. The project is production-tested, actively maintained, and released under the MIT License, making it suitable for both commercial and personal projects.
When teams consider Inbucket, these hosted platforms usually appear on the same shortlist.
Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.
Automated Integration Testing
CI/CD pipelines validate email content and delivery logic without external dependencies or API rate limits
Local Application Development
Developers capture and inspect outbound emails during feature development without configuring external SMTP services
QA Environment Email Capture
Testing teams verify email templates, personalization, and triggers in staging environments without risking real user inboxes
Microservices Email Validation
Containerized test suites verify notification services by querying Inbucket's REST API for expected message attributes
No. Inbucket includes built-in storage and requires no external database, message queue, or third-party service.
No. Inbucket is designed exclusively for testing and development. It lacks features required for production email delivery like queuing, retry logic, and deliverability optimization.
Emails are accessible via the web interface (default port 9000), RESTful API with an official Go client, or standard POP3 protocol (default port 1100).
By default, storage is ephemeral. Check the configuration documentation for options to persist messages if needed for your testing workflow.
Default ports are 2500 for SMTP, 9000 for the web interface, and 1100 for POP3. All ports are configurable via environment variables.
Project at a glance
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