Hi there!
First, let me clarify that this question is NOT related with a dedicated server hosted at LP, but I'm a customer of LP with 2 personal sites (2 domains) I have, and I thought I could get some help here.

Please feel free to move this thread if you consider doing so.
I like how LP manages spam (storing it in a folder called /spam), and the % of filtered mails. It's just... great.
I manage a dedicated server in the company I work. We develop sites (do not sell hosting), and then we host those sites in a dedicated server. We got around 70 domains in that server.
It uses Plesk 8.0.1, and it comes with SpamAssassin 3.0.6. I want to upgrade it to 3.1.7, but I simply don't know how. I know Linux a bit, but I'm not an expert, an either a veteran system administrator. I tried yum, webmin, googled, read docs, etc... with no clues about how to do this on our production server.
I want a result similar to the one obtained here, but I also don't know if LP does only with SpamAssasin or used another special software.
I've read about some other apps that allow some reverse testings. Also tried RBL lists, but I get problems as some cuestomers use proxies with ISPs that seem to be blocked sometimes (dynamic IPs, etc.) in their own personal Internet connection.
I hope someone can enlighten me a bit, as we all are tired about the spam.
I would be happy if, at least, I can upgrade SpamAssassin to 3.1.7... The first 3.1 version is from septembre 2005. I don't want to know about 3.0.6 ...

Thanks in advance!