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An all-in-one email service platform powered by Cloudflare | 基于 Cloudflare 的一站式邮箱服务平台 | Cloudflare Email 邮箱 Mail

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

The official Lark/飞书 CLI tool, maintained by the larksuite team — built for humans and AI Agents. Covers core business domains including Messenger, Docs, Base, Sheets, Calendar, Mail, Tasks, Meetings, and more, with 200+ commands and 20+ AI Agent Skills.

Home of the WebKit project, the browser engine used by Safari, Mail, App Store and many other applications on macOS, iOS and Linux.

Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

📮 A fully featured open source mail delivery platform for incoming & outgoing e-mail

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

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.

Named Tmux Manager: a Go control plane to spawn, tile, and coordinate multiple AI coding agents (Claude, Codex, Antigravity, omp, Grok) across tmux panes - graph-aware work triage, safety policy and approvals, Agent Mail coordination, checkpoints/timelines, and robot JSON + REST/SSE/WebSocket/OpenAPI surfaces.

An email newsletter application for the Django web application framework, including an extended admin interface, web (un)subscription, dynamic e-mail templates, an archive and HTML email support.

Open-source desktop AI agent that takes real actions on websites — 33 adapters for mail, shopping, social, and more.

:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.

A Really Ruby Mail Library

A multi-user, multi-group todo/ticketing system for Django projects. Includes CSV import and integrated mail tracking.

Catches mail and serves it through a dream.

IMAP mail filtering utility

C# library that moves your stylesheets to inline style attributes, for maximum compatibility with E-mail clients.

Mail Framework for C Language

📧 CLI to deduplicate mails from mail boxes

Mail hosting made simple

A fully tested email parser for PHP 8.0+ (mailparse extension wrapper).

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

Linux kernel crash utility NOTE: subscribe to mail list via https://lists.crash-utility.osci.io/admin/lists/devel.lists.crash-utility.osci.io/ for contribution and discussion. github pull requests will be reviewed but it is not the main development channel.

Watch (parts of) webpages and get notified when something changes via e-mail, on your phone or via other means. Highly configurable.

A handy library for creating and sending emails in PHP

Official master for the Greenmail project

:love_letter: An extensible desktop mail app built on the modern web. Forks welcome!

Ruby Document Template Processor based on docx templates and Mail Merge fields.

Inline styling for html mail in golang

Dovecot mail server