All-in-one open-source mail and collaboration server with SMTP, IMAP, JMAP, CalDAV, CardDAV, and WebDAV, plus integrated anti-spam and phishing protection.
14.5k stars926 forkslast commit Actively maintained
2 self-hosted Cisco Secure Email alternatives
Cloud-based email security gateway that scans inbound and outbound email for spam, phishing, malware and ransomware, using threat intelligence, URL and attachment analysis, sandboxing, policy-based encryption and DLP controls for enterprise email.
Alternatives to Cisco Secure Email
#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 Cisco Secure Email 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).
