* [Cloud Mail v3.2.0](https://github.com/maillab/cloud-mail) – Serverless email platform built on Cloudflare Workers with web and API support.

* [Kurrier v3.9.0](https://github.com/kurrier-org/kurrier) – Modern self-hosted webmail connecting IMAP, SMTP, SES, SendGrid, Mailgun and more into a unified, privacy-focused interface.

* [Alertmanager v0.34.0](https://github.com/prometheus/alertmanager) – Handles alerts sent by client applications, managing deduplication, grouping, and routing to various receivers.

* [MailFlow v3.0.0](https://github.com/maathimself/mailflow) – Self-hosted unified webmail client that connects multiple IMAP/SMTP accounts into one interface with search, notifications, and per-account actions.

* [postal-mime v3.0.0](https://github.com/postalsys/postal-mime) – Email parsing library for browser and serverless environments producing structured email objects.

* [Mailgun with Go v5.19.0](https://github.com/mailgun/mailgun-go) – Go library for interacting with the Mailgun API to send emails and manage events.

* [free-email-domains v1.10.0](https://github.com/Kikobeats/free-email-domains) – Comprehensive list of free email domains.

* [neomd v0.9.0](https://github.com/ssp-data/neomd) – Minimal terminal email client for reading rendered Markdown messages and composing in Neovim.

* [SpamEater v4.1.0](https://github.com/rufftruffles/spameater) – Privacy-focused disposable email service that auto-deletes messages after 24 hours and includes ModSecurity WAF protection.

* [dreamhunter2333/cloudflare\_temp\_email v1.11.1](https://github.com/dreamhunter2333/cloudflare_temp_email) – Cloudflare-based temporary email service offering free disposable addresses, attachment support, IMAP/SMTP access and Telegram bot notifications.

* [Mailtrap Node.js client v4.9.0](https://github.com/mailtrap/mailtrap-nodejs) – Node.js client for sending transactional and bulk emails with sandbox mode, attachments, and API token-based authentication.

* [Inbox Zero - Your AI Email Assistant desktop-v0.1.0](https://github.com/elie222/inbox-zero) – AI email assistant that helps users manage their inbox efficiently.

* [Forward Email v2.13.16](https://github.com/forwardemail/forwardemail.net) – Privacy-focused email service with forwarding, transactional, and newsletter sending features.

* [MailerSend Node.js SDK v3.2.0](https://github.com/mailersend/mailersend-nodejs) – Node.js SDK for sending emails and SMS, handling templates, attachments, bulk sends, and analytics.

* [Novu @novu/react-native@v...](https://github.com/novuhq/novu) – Unified API for sending notifications through multiple channels, including Inbox, Email, SMS, and Push.

* [Nodemailer v9.0.5](https://github.com/nodemailer/nodemailer) – Email sending library for Node.js.

* [React Email @react-email/editor@...](https://github.com/resend/react-email) – Collection of high-quality, unstyled React components for building responsive, consistent emails with dark mode support.

* [Juice v12.1.2](https://github.com/Automattic/juice) – Library that inlines CSS properties into HTML style attributes for email and web embedding.

* [go-premailer v1.35.0](https://github.com/vanng822/go-premailer) – Inlines CSS into HTML email for Go.

* [e2a v1.5.0](https://github.com/tokencanopy/e2a) – Authenticated email gateway for AI agents that verifies SPF, DKIM, and DMARC, then delivers evidence via webhook, WebSocket, REST, or MCP with optional human approval.

* [Email SDK @opencoredev/convex-...](https://github.com/opencoredev/email-sdk) – Lightweight TypeScript SDK for transactional email pipelines with adapter routing, retries, fallbacks, and observability.

* [Upyo 0.5.2](https://github.com/dahlia/upyo) – Cross-runtime library for sending email messages using SMTP and various providers.

* [Onetime Secret v0.26.9](https://github.com/onetimesecret/onetimesecret) – Securely share sensitive information through a single-use link that can be viewed only once.

* [useSend v1.9.7](https://github.com/usesend/useSend) – Email sending and management platform with dashboard, API, SMTP, and bulk campaign support.

* [Monocart Reporter 2.12.6](https://github.com/cenfun/monocart-reporter) – Playwright test reporter for Node.js that generates fast, customizable HTML reports with interactive filtering, timeline graphs, and exportable data.

* [Letters v0.4.0](https://github.com/mnako/letters) – Minimal Go library for parsing plaintext and MIME emails, decoding text encodings and file attachments into structured headers, bodies, and inline/attached content.

* [nondisposable v0.3.0](https://github.com/rameerez/nondisposable) – Rails validation and updater that prevents signups using disposable email addresses.

* [Mail2Go 1.2.0](https://github.com/KeepSec-Technologies/Mail2Go) – Lightweight Go-based command-line SMTP client for sending emails with configurable server settings, TLS options, recipients, body content, and attachments.

* [Wavebox v151.2.141-stable](https://github.com/wavebox/waveboxapp) – Chromium-based browser optimized for productive web-app workflows with tab management, sleeping tabs, cookie containers, profiles, and split-screen.

* [Nylas CLI v3.1.30](https://github.com/nylas/cli) – Command-line tool for Nylas API authentication and managing email, calendar, contacts, webhooks, timezone utilities, and OTP extraction.

* [Tuta Mail tuta-drive-ios-relea...](https://github.com/tutao/tutanota) – Secure email service with built-in end-to-end encryption for safe communication across devices.

* [Better Svelte Email @better-svelte-email...](https://github.com/Konixy/better-svelte-email) – Svelte-based email framework with first-class Tailwind CSS support and built-in preview.

* [Pelton v2026.4](https://github.com/TRC-Loop/Pelton) – Privacy-first, cross-platform email client that keeps data local, supports fast local search, and provides attachment preview and offline downloads.