Communication - Email - Mail Transfer Agents
Mail Transfer Agents (MTAs) - SMTP servers.
10 Apps
Haraka
Fast, highly extensible, and event driven SMTP server.
OpenTrashmail
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.
OpenSMTPD
Secure SMTP server implementation from the OpenBSD project.
DragonFly
A small MTA for home and office use. Works on Linux and FreeBSD.
chasquid
SMTP (email) server with a focus on simplicity, security, and ease of operation.
Courier MTA
Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
EmailRelay
A small and easy to configure SMTP and POP3 server for Windows and Linux.
Exim
Message transfer agent (MTA) developed at the University of Cambridge.
Postfix
Fast, easy to administer, and secure Sendmail replacement.
Sendmail
Message transfer agent (MTA).