mheymann
> I have an SME 6.1 server
> My problem now is that I am still getting a lot of spam getting through to the users inboxes
> I am lokking for a way for the system to get better at blocking this spam
> I have read about Bayesian Filters
If you are serious about dealing with spam, then your first step is to upgrade to sme7.0.
It has better mail handling than sme6 and will reject spam more effectively.
There is also a nice contrib to utilise Bayesian filtering and allow users to move undetected spam to a folder for "learning", which will in time reduce the incidence of undetected spam, search on LearnAsSpam.
I would also enable various settings relating to RBL's etc & enable & set custom settings for spamassassin in server manager.