email-api

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

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.

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.

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

One simple SDK for transactional email across 23 adapters

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

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.

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

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

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

Cloudflare Worker that acts as a temporary email inbox

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

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

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.

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

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

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

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

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

The most complete Mailchimp Marketing API MCP server: 227 tools across campaigns, audiences, reports, segments, automations and full e-commerce, with multi-account support and runtime-security guardrails (read-only, dry-run, audit, per-tool risk metadata).