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.

Elixir client for the Mandrill transactional email API.

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

SocketLabs Email Delivery .NET Client Library

Official Laravel integration for the Lettr email API

Laravel mail transport for Plunk API with attachments, event tracking, email verification, templates and self-hosted support

SocketLabs Email Delivery Go Client Library https://www.socketlabs.com

A collection of Free, open-source MJML email templates.

Compose, deliver, and test emails in Rust - pluggable providers with zero configuration

Open source transactional email API built on Cloudflare Workers — self-host your own email sending infrastructure

Go SDK for Amply

mjml-java: Zero-dependency Java renderer for MJML, enabling responsive email template creation. Open-source with MIT License.

Playwright fixtures to easily integrate with MailHog

Official PHP SDK for the Lettr email API

MCP server for the Inxmail Commerce transactional API — events, sendings, bounces, blocklist, blacklist, reactions, and delivery tracking from Claude.

Official Go SDK for the Lettr email API

Official Node.js SDK and CLI for the Lettr email API

Domain email + Resend alternative powered by Cloudflare. Drop-in: just point the Resend SDK at this Worker via RESEND_BASE_URL.

Free SMTP Relay for developers — send emails from any app, script or device. Zero cost. Zero limits.