Self-hosted mail, file sync and email archiving: MailEnable, Mailu mail server, Syncthing and Piler email archiving.
MailEnable is a mail server for Windows Server with SMTP, POP3, IMAP, webmail, list server and antispam. The Standard Edition is free with unlimited users and domains; paid editions add ActiveSync, collaboration and clustering.
Mailu is a free, open-source (MIT) mail server delivered as Docker containers: SMTP, IMAP, webmail, web admin, antispam, optional antivirus, DKIM, DMARC and MTA-STS, configured through one env file on a Linux server.
Syncthing is a free, open-source tool that keeps folders in sync directly between your devices over encrypted connections, with no cloud service or account. It runs on Windows, macOS, Linux and BSD with a local web interface, and in Docker.
Piler (mailpiler) is a self-hosted email archive: your mail server sends it a copy of every message, and it deduplicates, indexes and retains them with full-text search, legal hold and audit logs. Open Source Edition is free (GPL-3.0); Linux or Docker.
