I have had my own email running through the SpamFreeEmail.com system for well over a year now and it has been working great. I’ve watched it learn about my email and automatically start forwarding mail that was good, while I never once got an email message sent through the system that was bad.
I had a few false positives in that some email was marked as spam when it was not, but those were easily enough fixed in the system.
I consider the BETA a success and a full working prototype of what an Erlang based spam filter could be, but it’s not enough 
After spending a lot of time on the Netflix Prize, which I was working on in pure Erlang, I have learned so much about the language that I wanted to redesign how SFE was working. Unfortunately for me, I did not have enough hardware to run my beta test and redesign the system at the same time. At least not enough hardware for myself to feel comfortable.
I also have been wanting to implement some of the modules I have been working on in my ErlMail project, which has now become part of the work I am doing at http://erlsoft.org, which involves rewriting most core Internet servers in a way that they fully integrate with each other.
Lastly, I want to redesign SFE to be written in pure Erlang. I had been suing MySQL as a storage engine for most of the data and I truly believe the interaction between the two was slowing the system down. They were communicating perfectly, but the MySQL server was having trouble performing the intense actions I was trying to do.
So the SFE BETA will be down for a while. It will be back up in a largely rebuilt and restructured form and will be better for it