All-in-one open-source mail and collaboration server with SMTP, IMAP, JMAP, CalDAV, CardDAV, and WebDAV, plus integrated anti-spam and phishing protection.
14.4k stars909 forkslast commit Actively maintained
2 self-hosted Mimecast Email Security alternatives
Cloud-based email security platform that defends organizations against phishing, malware, ransomware and business email compromise. Provides email continuity, secure archiving, threat intelligence, data loss prevention and human-risk management for messaging and collaboration.
Alternatives to Mimecast Email Security
#2
Mailu is a full-featured mail server distributed as Docker images, providing SMTP/IMAP/POP3, webmail, administration UI, and built-in security and anti-spam features.
7.5k stars997 forkslast commit Actively maintained
What replacing Mimecast Email Security actually involves
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 2 of 2 shipped a commit in the last six months. In exchange you take on hosting, backups and updates yourself.
Browse everything in Email Servers (SMTP/IMAP).
