Posthorn
Posthorn is an open-source, self-hosted outbound mail gateway that acts as a bridge between your applications and transactional email providers like Postmark, Resend, Mailgun, and AWS SES. It supports multiple ingress methods (HTTP form, API, SMTP) and eliminates the need to run a dedicated mail server. Designed for developers and sysadmins managing self-hosted projects.
Overview
8 featuresPosthorn sits in PulseGate's Messaging, queues & streaming category. It simplifies sending transactional emails from self-hosted apps without running a mail server. It is built as an open-source project for self-hosted app developers and sysadmins. Posthorn is open source under the Open Source license. It runs on the web, the command line, and API, and it can be self-hosted.
It is developed by Craig McCaskill, and it first shipped in 2024. Among its 8 catalogued features are SMTP gateway, API integration, and provider bridging. It exposes integrations via a public API.
Summary written by a language model from the project’s public pages.
- SMTP gateway
- API integration
- Provider bridging
- Self-hosted
- No mail server required
- Multiple ingress methods
- Unified config
- Transactional email support
Built with & integrations
- Astro
- /_astro/ in the HTML
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
- Indexed1 Jul · 11:11 UTCcraigmccaskill/posthorn verified via GitHub Search (Smart)Source: GitHub Search (Smart) · Open
Frequently asked questions about Posthorn
- What is Posthorn?
- Posthorn simplifies sending transactional emails from self-hosted apps without running a mail server. It is catalogued under Messaging, queues & streaming on PulseGate.
- Who should use Posthorn?
- Posthorn is an open-source project built for self-hosted app developers and sysadmins.
- Does Posthorn have a free plan?
- Yes — Posthorn is open source under the Open Source license and free to use.
- What platforms does Posthorn run on?
- Posthorn runs on the web, the command line, and API. It can also be self-hosted.
- Is Posthorn still active?
- Unverified. Posthorn has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
- Who makes Posthorn?
- Posthorn is developed by Craig McCaskill.
- When did Posthorn launch?
- Posthorn first shipped in 2024.
- Is Posthorn open source?
- Yes — Posthorn is open source under the Open Source license, developed on GitHub.
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