1) Logging. We've been using MDaemon since the 90s to diagnose delivery issues with Exchange because everything is beautifully transparent. 2) Security: native support for Geo-IP blocking, automated dynamic blacklisting, the ability to temporarily ban IPs based on excessive authentication failures, deeply granular control of security features... an endless wish-list of well-thought-out features that will make any Exchange admin weep. Truly some of the best security we've ever seen, hands down. 3) Much easier to administer than Exchange - especially certificate management. 4) Stable and robust: we've never seen MDaemon fail completely or corrupt the data as we've seen time and time again with Exchange. We attribute this to the data being stored as individual .msg files in a simple file system instead of an easily corrupted database. You would think having 10s of thousands of files in a single folder would cause MDaemon to choke, and we have seen some performance issues, but so far nothing deal-breaking.

It is an inexpensive solution. Also, the FREE email tech support is excellent. Tech support is excellent. The technician explained how to troubleshoot issues.

Mdaemon provides all the functionality we need from an enterprise mail system.