An email and SMTP testing tool with API for developers
⚡ Executive Summary & Quick Facts
Authoritative Sourcemailpit is mailpit is an open-source project written in Go: An email and SMTP testing tool with API for developers..
| Repository | axllent/mailpit ↗ |
|---|---|
| Primary Category | email testing |
| Language & Stack | Go |
| Software License | MIT |
| Community Traction | ★ 10.7K stars · ⑂ 362 forks · #1,370 globally |
| Maintenance | ● Active (Last commit: Oct 20, 2026) · 1 open issues |
| Target Audience | Developers and engineering teams building with Go, seeking reliable, tested, and actively maintained tooling for production workloads. |
Star History
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+268
STARS · LAST 30 DAYS
9
PER DAY
#187
MOST-STARRED Go
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +63 | +268 | +810 |
| Per day | 9 | 9 | 9 |
| Forks gained | +2 | +7 | +18 |
mailpit gained 268 stars in the last 30 days, about 9 a day, and now has 10.7K. It is about 4 years old and has averaged roughly 2.7K stars a year. It ranks #187 among Go repositories and #1,370 across all languages on GitHubRepo.
Trending Record
6
DAYS ON TRENDING
#5408
BEST RANK
Oct 20, 2026
FIRST APPEARANCE
Active
STATUS TODAY
mailpit has maintained a continuous presence across global trending indexes, peaking at #5408. Below is the 30-day activity profile:
💡 Overview
mailpit is an open-source project written in Go: An email and SMTP testing tool with API for developers.
Engineered for speed, consistency, and developer ease, it solves common hurdles in email-testing, go, golang. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in Go for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ go install github.com/axllent/mailpit@latest⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
Go >= 1.21 runtime environment
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
mailpit coordinates its core functionality through a modular Go pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Autonomous AI Agents
Orchestrate intelligent workflows and tool-calling routines with mailpit.
Model Inference & Prompting
Integrate fast, local or cloud-hosted generative AI models directly into production code.
Context Memory & RAG
Augment language models with dynamic vector retrieval and structured project memory.
Developer Productivity
Automate repetitive engineering tasks, code generation, and test creation using AI agents.
🚀 Getting Started
Install mailpit using your package manager: `go install github.com/axllent/mailpit@latest`
Initialize your project workspace or configuration file for mailpit.
Import mailpit into your codebase or invoke it directly from your terminal.
Execute your test suite or run `mailpit --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with Go, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
axllent/mailpit is currently ranked #1,370 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #1,365 | microsoft/inshellisense | TypeScript | ★ 10.7K | Compare ↗ |
| #1,366 | screego/server | Go | ★ 10.7K | Compare ↗ |
| #1,366 | skypilot-org/skypilot | Python | ★ 10.7K | Compare ↗ |
| #1,368 | tstack/lnav | C++ | ★ 10.7K | Compare ↗ |
| #1,369 | mockery/mockery | PHP | ★ 10.7K | Compare ↗ |
| #1,370 | axllent/mailpit This Project | Go | ★ 10.7K | |
| #1,370 | nodejs/node-gyp | Python | ★ 10.7K | Compare ↗ |
| #1,372 | blacklanternsecurity/bbot | Python | ★ 10.7K | Compare ↗ |
| #1,373 | foundry-rs/foundry | Rust | ★ 10.7K | Compare ↗ |
| #1,374 | cosscom/ui | TypeScript | ★ 10.7K | Compare ↗ |
| #1,375 | hydra-ecosystem/hydra | Python | ★ 10.7K | Compare ↗ |
Frequently Asked Questions
What does mailpit do? +
An email and SMTP testing tool with API for developers
What language is mailpit written in? +
The primary language is Go. Topics include: email-testing, go, golang, mailpit, pop3-server.
Is mailpit actively maintained? +
Yes, the last recorded push was on Oct 20, 2026 with 1 open issues being tracked.
How many stars does mailpit have? +
mailpit has 10,703 stars and 362 forks on GitHub.
How does mailpit rank among GitHub repositories? +
With 10,703 stars, axllent/mailpit is ranked #1,370 globally across all repositories tracked on GitHubRepo and #187 among Go projects.
What license is mailpit distributed under? +
The repository reports a MIT license. Always verify the repository LICENSE file for legal terms.
