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Sellbird (formerly Harvey): the open-source outreach platform that runs on your Claude or ChatGPT plan. Finds companies and decision makers, verifies emails, writes personal cold email, sends it and handles the replies.
Own the flow: one open-source AI platform for your knowledge, models and channels – web, WhatsApp, email, Outlook, Nextcloud & ownCloud. Local and cloud models side by side, with the cost on every answer.
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
The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.
Check if an email address exists without sending any email, written in Rust. Comes with a ⚙️ HTTP backend.
An email and SMTP testing tool with API for developers
120 marketing skills as an AI marketing staff — plugin, portable skills, or an 8-bot team across 7 disciplines (narrative, SEO/GEO, social, email, paid, influencer, launch) on one contract, with 8 auditor gates: TALE · CORE-EEAT · CITE · ECHO · SEND · ROAS · STAR · RAMP.
Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)
AI-native open-source alternative to Vercel + Sentry + PostHog + Pingdom + Resend + E2B. 440+ CLI operations with drop-in skills for Claude Code, Codex & OpenCode — deployments, analytics, session replay, error tracking, OpenTelemetry, email, sandboxes & AI gateway in one self-hosted Rust binary.
Open-source transactional email API and self-hostable Resend alternative. SMTP, inbound mail, webhooks, and campaigns for developers.
Self-hosted multi-account email client with support for JMAP/IMAP/SMTP, direct integration with Gmail and Outlook APIs. Also Contacts and Calendar. Built with Go, templ, and HTMX, SQLite for storage
MJML: the only framework that makes responsive email easy
A full-featured IPTV editor, including features similar to xteve or threadfin. With full EPG management, Xtream API output, ability to store and sync .strm files, post processing with ability to call custom scripts, send webhook requests, or send an email, and much more!
The batteries-included full-stack framework for the AI era. Develop JS/TS web apps (React, Node.js, and Prisma) using declarative code that abstracts away complex full-stack features like auth, background jobs, RPC, email sending, end-to-end type safety, single-command deployment, and more.
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.
Self-hosted email server with Docker/Kubernetes support. Features IMAP, SMTP, spam filtering, webmail, and web admin.
📧 An Email Condom for your Ruby Server
Email::Outlook::Message Perl module for reading Outlook .msg files
Jenkins Email Extension Plugin
smtp4dev - the fake smtp email server for development and testing
Google Chrome, Firefox, and Thunderbird extension that lets you write email in Markdown and render it before sending.
A curses threads-with-tags style email client
A fully tested email parser for PHP 8.0+ (mailparse extension wrapper).
Apache Commons Email
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.
Ruby gem to check whether an email address or domain belongs to a government (.gov, .mil, and worldwide gov domains)
List of sites with two factor auth support which includes SMS, email, phone calls, hardware, and software.
Email subscriptions for Rails
An email framework that converts simple HTML into responsive email-ready HTML.
Fully functional Open Source email marketing manager for creating, sending, integrating, and analysing email campaigns and newsletters.