Mailcheap

Maildun is a self-hosted email platform for teams that combines audience management, email campaigns, transactional email, automations, and first-party engagement tracking in one application. It runs on the operator's infrastructure and sends workspace email through Amazon SES or SMTP, with audiences supporting custom attributes, tags, segments, CSV imports, double opt-in, and hosted subscribe forms. Campaigns use a visual editor and support reusable templates, scheduling, attachments, test sends, and engagement insights; transactional messages are exposed through a team-scoped, versioned JSON API; and event-driven automations use durable jobs that resume after restarts. It also provides SES bounce and complaint processing, optional local geolocation databases for tracking, team workspaces with roles and authentication features, Redis-backed queues, and an MCP server for AI-assisted workspace operations. The project is built with Laravel, Inertia, React, TypeScript, Redis, and Laravel Horizon, and is currently in beta. It is licensed under AGPL-3.0-only with additional attribution and naming terms.

OpenSend is a self-hosted transactional and marketing email platform built on Amazon SES for sending transactional mail, newsletters, and campaigns. It provides a dashboard, a TypeScript SDK distributed as the `opensend-js` npm package, and an MCP server over one public API; the video also describes send simulation and delivery-status logs. The project supports Docker or Cloudflare deployment, uses Google-only sign-in, keeps API-secret setup out of the browser, and recommends starting with simulated sending before provisioning infrastructure or sending real email.

Mailflare is a self-hosted email inbox for custom domains, built on Cloudflare. It provides domain connection and Cloudflare Email Routing setup, personal and shared mailboxes with delegated access, message composition and receiving with attachments and rich formatting, and organization tools such as search, folders, stars, snoozing, archiving, spam, and trash. Routing rules can store, forward, reject, or categorize incoming messages. When deployed to Cloudflare, Mailflare uses Email Routing for inbound delivery, Cloudflare's email service for outbound messages, a D1 database for mail data, and an R2 bucket for attachments. It can also run as a Docker container using SQLite and local files, with a built-in SMTP listener or a Cloudflare relay Worker for inbound mail and an SMTP relay or Cloudflare Email Sending for outbound mail. The project also includes account and permission management, API keys, webhooks, audit logs, backups, import and export, contacts, and sender blocking.

plMail is a self-hosted mail client with a calendar alongside it. It connects existing IMAP, Gmail, and Outlook mailboxes, synchronizes them into a PostgreSQL database, and presents them in one inbox with threaded conversations, shared labels, full-text search, filters, and sending aliases. It is not a mail server and does not receive internet mail or host a domain. New mail is delivered through IMAP IDLE, Gmail and Outlook push, and browser notifications. The calendar supports two-way synchronization with Google, Microsoft, and CalDAV, including invitations, drag-to-move scheduling, sharing, and booking links. Optional language-model features can use Ollama or an OpenAI-compatible endpoint to search by meaning, draft replies, summarize threads, and sort messages; these features are disabled by default and can be run against a model on the user's own network. The project provides Docker images for linux/amd64 and linux/arm64, a TrueNAS app, and companion Android and iOS applications that connect to a plMail server. It is released under the AGPL-3.0 license.

CogSend is a self-hosted social media scheduler that runs on the user's Cloudflare account. It lets users write a draft, customize it per platform, add images and alt text, automatically split long drafts into threads, and publish immediately or schedule posts for Mastodon, Bluesky, LinkedIn, Threads, and X. The scheduler reports delivery results per account, retries temporary failures, and supports cancellation, rescheduling, and manual retries; it also provides link previews and publication-failure insights. The application stores data in Cloudflare D1 and media in R2, sends posts through the user's API credentials, encrypts credentials, and protects the administrator account with two-factor authentication. It provides a personal API key and an MCP server for scripts, Shortcuts, Claude Code, Codex, or other MCP clients to draft, schedule, and publish posts. It is built with SvelteKit on Cloudflare Workers, uses Drizzle with D1 SQLite, and is licensed under the MIT License.