Merak Mail Server 7.0.1 - More Spam Challenges

Merak Mail Server, the uberserver is ever more becoming an uberdruberserver. The latest version update brings many enhancements to the Bayesian spam filtering, which can challenge unknown senders of emails that are neither certainly spam nor certainly good mail now, lots of calendaring features, secure S/MIME messaging in Merak WebMail, full support for IPv6, and a lot more.
Merak Mail Server is a complete, capable and secure mail server that can adapt to all mailing needs gracefully and integrates server-side Bayesian spam filtering as well as instant messaging. (Windows)