transactional-email

Open-source, self-hosted newsletter, email marketing and transactional email platform. Visual MJML editor, Liquid templating, 7 sending providers.

Self-hosted transactional email platform — send through your own AWS SES account, keep the dashboard, API keys, delivery logs, and webhooks on your own infrastructure.

Self-hosted email delivery platform that enables applications to send emails via HTTP APIs while handling SMTP delivery, templates, storage, security, and analytics. Fully self-hostable alternative to services like SendGrid or Mailgun.

One simple SDK for transactional email across 23 adapters

One unified email API across 18 providers (SMTP, Resend, SES, Postmark, SendGrid, Mailgun, …). Zero deps, RFC 8058 + DKIM ready, edge-first, strict TypeScript.

Self-hosted email sending platform built on Cloudflare Email Sending — REST API, admin UI, templates, domain management, scoped API keys, all in one Docker container.

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.

The open-source email platform — self-host on your own AWS SES, or use the cloud. Resend-compatible API.

An open-source & self-hostable AWS SES / SendGrid / Mailchimp / Resend / Loops alternative.

Elixir client for the Mandrill transactional email API.

A Resend-compatible email platform on Cloudflare Workers — transactional sending, broadcasts, automations, inbound mail and deliverability analytics. MIT, one-click deployable into your own account.

Self-hosted email API for developers free alternative to SendGrid/Resend

The official Postmark Python SDK

Free, responsive HTML email templates for transactional, ecommerce, marketing, newsletter, and Supabase emails.

Open-source email marketing platform. Self-hostable, API-first, built with Go and Vue.

Build beautiful, reliable HTML emails with SolidJS.

SocketLabs Email Delivery .NET Client Library

The send half of OpenOutreach: reads qualified leads on stdin (outfind find --json | outsend), persists them to its own store, and sends on its own clock.

Open-source transactional email in Rust. Self-host it or use the EU cloud. SMTP and HTTP APIs, DKIM/SPF, inbound routing, webhooks, tracking, and a full dashboard.

Open-source TypeScript messaging infrastructure for Email, SMS, WhatsApp & Push with interchangeable providers.