Kate,
The previous discussion of the windows live spaces spam was from
10/18/2008 and it has the subject "Windows Live Spaces spam". That
should help you search the archive.
I will look into the BOTNET as I don't believe we are using this at the
moment. Do you get many fp's with this?
In my experience, yes, you will get a lot of false positives with the
BOTNET plugin. When I was using, I found that a lot of mailing lists
and a lot of mail servers weren't configured properly in DNS or had
other (legitimate in my estimation) configurations that tripped BOTNET.
Best,
Jesse