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

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• Updated Nov 12, 2026
• Go

Open-source email infrastructure for AI agents: secure inboxes, REST and MCP APIs, SMTP, human approval workflows, signed webhooks, and Python and TypeScript SDKs. Self-host with Docker and PostgreSQL.

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• Updated Oct 22, 2026
• Python

Open-source, privacy-focused email service for custom domains. Free email forwarding, encrypted mailboxes (IMAP/POP3), SMTP sending, calendars and contacts (CalDAV/CardDAV), webhooks, and an email API. Self-host it with Docker. A private alternative to Gmail, Mailchimp, and SendGrid.

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• Updated Nov 12, 2026
• JavaScript

Find existing email addresses by nickname using API/SMTP checking methods without user notification. Please, don't hesitate to improve cat's job! 🐱🔎 📬

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• Updated Sep 5, 2026
• Python

One simple SDK for transactional email across 23 adapters

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• Updated Nov 12, 2026
• MDX

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

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• Updated Nov 10, 2026
• 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.

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• Updated Nov 12, 2026
• TypeScript

Open-source email API for applications and AI agents. Managed hosting at e2a.dev, or self-host with Docker.

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• Updated Nov 9, 2026
• Go

Open-source transactional email API and self-hostable Resend alternative. SMTP, inbound mail, webhooks, and campaigns for developers.

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• Updated Nov 12, 2026
• TypeScript

EmailJS helps sending emails using client side technologies only. No server is required.

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• Updated Oct 10, 2026
• TypeScript

Cloudflare Worker that acts as a temporary email inbox

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• Updated Apr 6, 2026
• TypeScript

SDK, skills, and examples for Inkbox: give AI agents a persistent identity with email, phone number, and internet address

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• Updated Nov 12, 2026
• TypeScript

Enterprise project tracker, tracks commits done by employees after getting assigned to a couple of projects by their managers

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• Updated Oct 9, 2023
• Java

Official Mailtrap MCP server — over 125 tools to send email from Claude, Cursor, VS Code & other AI assistants. Send transactional and bulk email, test in Email Sandbox, manage templates, contacts, domains and webhooks, and inspect delivery logs and stats.

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• Updated Nov 11, 2026
• TypeScript

Email inbox API for AI agents, self-hosted on Cloudflare Workers. Open source, with an MCP server. AgentMail alternative.

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• Updated Oct 5, 2026
• TypeScript

Example AI agents using AgentMail — hiring screener, legal intake, receipt parser, contract redline, and more.

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• Updated Aug 11, 2026
• Python

Agent-native disposable email — Cloudflare Workers + Durable Objects, with CLI & MCP. https://smails.dev

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• Updated Nov 5, 2026
• TypeScript

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

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• Updated Nov 9, 2026
• TypeScript

A Cloudflare Workers email gateway with multi-SMTP support and a unified HTTP sending API.

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• Updated Oct 14, 2026
• HTML

EmitMail is an open-source, self-hosted alternative to Resend for transactional email. Send emails through a REST API or the Resend Node.js SDK, manage delivery with a dashboard, and receive messages in built-in inboxes. Run it on your own infrastructure with Docker Compose and keep control of your email data, configuration, and costs.

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• Updated Nov 12, 2026
• TypeScript