Host Communication - Email - Mail Transfer Agents Tools

SMTP (email) server with a focus on simplicity, security, and ease of operation.

Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.

A small MTA for home and office use. Works on Linux and FreeBSD.

A small and easy to configure SMTP and POP3 server for Windows and Linux.

Message transfer agent (MTA) developed at the University of Cambridge.

High-performance, pluginable SMTP server written in Javascript.

Ruby gem that deploys a simply SMTP MTA gateway that accepts all mail and displays in web interface. Useful for debugging or development.

Secure SMTP server implementation from the OpenBSD project.

Complete trashmail solution that exposes an SMTP server and has a web interface to manage received emails. Works with multiple and wildcard domains and is fully file based (no database needed). Includes RSS feeds and JSON API.

Fast, easy to administer, and secure Sendmail replacement.

Message transfer agent (MTA).

Mail Transfer Library built on Python.

Modern SMTP server designed with a focus on security, speed, and extensive configurability.