Best self-hosted Communication - Email - Mail Transfer Agents apps
Mail Transfer Agents (MTAs) - SMTP servers.
10 open source Communication - Email - Mail Transfer Agents tools you host on your own server — with full control of your data and no per-user cost.
Haraka
★ 5,588Fast, highly extensible, and event driven SMTP server.
OpenTrashmail
★ 867Complete 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
★ 576Secure SMTP server implementation from the OpenBSD project.
DragonFly
★ 259A 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).
Frequently asked questions
What are the best self-hosted Communication - Email - Mail Transfer Agents tools?
Among the 10 options, the most popular include Haraka, OpenTrashmail, OpenSMTPD. Compare license, platform and popularity in the list below.
Is there a free open source alternative for Communication - Email - Mail Transfer Agents?
Yes — all 10 tools on this page are open source and you run them on your own server, with no monthly fee.
Where can I host a Communication - Email - Mail Transfer Agents app?
On a home server (homelab) or a cheap VPS from ~€4/mo. See the suggestions on this page.