craigmccaskill/posthorn
Self-hosted email gateway between your apps and a transactional mail provider (Postmark, Resend, Mailgun, AWS SES, or outbound-SMTP). Three ingress shapes (HTTP form, HTTP API, SMTP). One Docker container, one TOML config.
Star History
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+10
STARS · LAST 30 DAYS
1
PER DAY
#1,209
MOST-STARRED Go
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +0 | +10 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +0 | +3 | +10 |
posthorn gained 10 stars in the last 30 days, about 1 a day, and now has 214. It is about 1 year old and has averaged roughly 214 stars a year. It ranks #1,209 among Go repositories and #11,432 across all languages on GitHubRepo.
Trending Record
15
DAYS ON TRENDING
#5702
BEST RANK
Sep 29, 2026
FIRST APPEARANCE
Active
STATUS TODAY
posthorn has maintained a continuous presence across global trending indexes, peaking at #5702. Below is the 30-day activity profile:
💡 Overview
posthorn is an open-source project written in Go: Self-hosted email gateway between your apps and a transactional mail provider (Postmark, Resend, Mailgun, AWS SES, or outbound-SMTP). Three ingress shapes (HTTP form, HTTP API, SMTP). One Docker container, one TOML config.
Engineered for speed, consistency, and developer ease, it solves common hurdles in docker, email, email-gateway. 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/craigmccaskill/posthorn@latest⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
Go >= 1.21 runtime environment
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
posthorn 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 posthorn.
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 posthorn using your package manager: `go install github.com/craigmccaskill/posthorn@latest`
Initialize your project workspace or configuration file for posthorn.
Import posthorn into your codebase or invoke it directly from your terminal.
Execute your test suite or run `posthorn --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
craigmccaskill/posthorn is currently ranked #11,432 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #11,419 | lifinance/contracts | TypeScript | ★ 215 | Compare ↗ |
| #11,419 | succinctlabs/op-succinct | Rust | ★ 215 | Compare ↗ |
| #11,419 | bugsfreeweb/LiveTVCollector | Python | ★ 215 | Compare ↗ |
| #11,419 | mlm-games/BatStats | Kotlin | ★ 215 | Compare ↗ |
| #11,419 | Helweg/open-codebase-index | TypeScript | ★ 215 | Compare ↗ |
| #11,432 | craigmccaskill/posthorn This Project | Go | ★ 214 | |
| #11,432 | jstrait/wavefile | Ruby | ★ 214 | Compare ↗ |
| #11,432 | troglobit/pimd | C | ★ 214 | Compare ↗ |
| #11,432 | apache/commons-configuration | Java | ★ 214 | Compare ↗ |
| #11,432 | microsoft/o365-moodle | PHP | ★ 214 | Compare ↗ |
| #11,432 | Serg-Norseman/GEDKeeper | C# | ★ 214 | Compare ↗ |
Frequently Asked Questions
What does posthorn do? +
Self-hosted email gateway between your apps and a transactional mail provider (Postmark, Resend, Mailgun, AWS SES, or outbound-SMTP). Three ingress shapes (HTTP form, HTTP API, SMTP). One Docker container, one TOML config.
What language is posthorn written in? +
The primary language is Go. Topics include: docker, email, email-gateway, go, homelab.
Is posthorn actively maintained? +
Yes, the last recorded push was on Oct 3, 2026 with 36 open issues being tracked.
How many stars does posthorn have? +
posthorn has 214 stars and 12 forks on GitHub.
How does posthorn rank among GitHub repositories? +
With 214 stars, craigmccaskill/posthorn is ranked #11,432 globally across all repositories tracked on GitHubRepo and #1,209 among Go projects.
What license is posthorn distributed under? +
The repository reports a Apache-2.0 license. Always verify the repository LICENSE file for legal terms.
