Email SDK is a lightweight TypeScript library for sending email through Resend, Postmark, SendGrid, Mailgun, Brevo, SMTP, and more

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 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.

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

Build beautiful, reliable HTML emails with SolidJS.

Official Laravel integration for the Lettr email API

Provider-neutral transactional and marketing email bridge for Laravel 12+, using official provider SDKs behind one clean API.

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

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

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

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

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

Go SDK for Amply

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