I had a quick test of it, as I was evaluating ways to put in spam filtering before hitting mailarchiva in the Zimbra milter. Tried mailcleaner, ASSP, and someone directed me to mxhero.
Some feedback:
1) you need to have some way to collate/view logs from the internal processes. Otherwise, one of the major problems with dealing with false positives in SPAM, is to try to find out what happened to the message. So short of ssh'ing into the box, there's no real way to find out from the current interface (the reports -> social sort of works, but not quite in enough detail)
2) unable to login as user to a registered domain. I've created and sync'd a zimbra domain+associated users across. But I can't login as one of the users. I tried user/domain=user@domain, as well as just user, but not successful. So I don't know if the user's interface allows them to check, mark and retrieve invalid messages.
3) I know flash is nifty, but it just makes the interface very difficult to navigate!
Not sure I'd use it in production compared to ASSP yet. Thanks for your work though.
Release 7.2.0_GA_2669.UBUNTU10_64 UBUNTU10_64 FOSS edition