Privacy-first password manager with built-in email aliasing. Fully encrypted and self-hostable.

Nortix Mail - disposable email server with an easy setup

The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.

Full-featured, multi-account MCP email server for Windows, macOS, and Linux—read, search, organize, and send email via IMAP and SMTP.

Self-hosted mail server for your own domain: SMTP/IMAP/POP3, CardDAV/CalDAV, React webmail and admin console, one-command Docker Compose.

madmail is a lightweight, single-binary, PGP-only, and resilient mail server designed for instant messaging using DeltaChat.

Hermes Secure Email Gateway is a Free Open Source Secure Email Gateway and Email Server

Self-hosted inbound email infrastructure with a high-performance C++ SMTP ingestion engine, local storage, and developer APIs.

Self-hosted multi-user business email — Cloudflare Email Routing (inbound) + Resend (outbound), Node.js + SQLite. Send & receive with your own domain, per-user mailboxes & logins.

Carbonio - Mailbox

Self-hosted personal email server with IMAP, SMTP, CalDAV/CardDAV. Privacy-focused alternative to Gmail/Outlook. Features: auto-TLS, DKIM/SPF/DMARC, greylisting, Prometheus metrics, audit logging.

A professional, high-performance SMTP server library for .NET with minimal dependencies. Features TLS/SSL, authentication, rate limiting, and extensible architecture for building custom email servers.

The best Send-Only Email server

Email-based reminder service - schedule reminders by sending emails to time-coded addresses like remind+1h@domain.com

Documentations for iRedMail.

Lightweight self-hosted email server with Docker: SMTP, IMAP, webmail, REST API. Disposable/temp mail and multi-domain inboxes without Postfix.

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

Realistic email testing server in a single Docker container. SMTP, IMAP, DKIM/DMARC, spam filtering, REST API, Node/Python SDKs, and an MCP server.

A secure internal mailing backend built with Python, Flask, and SQLAlchemy. Features async email scheduling via APScheduler, dynamic HTML template rendering, group/broadcast targeting, and real-time delivery tracking analytics.

Using Cisco Packet Tracer I have built a complex Network design for school.