Auto delete if >= X on per user basis

[Craig Mead]

Hello all,

I've had a good look around but am unable to find an answer to this 
exact scenario. I've had a bash @ using global settings on the 
user_pref's file, but didn't appear to work, so figured I'd ask. If you 
are aware of a reference to this that I've missed, I apologise.

Pretty much all I'm trying to do is setup on a per-user basis an auto 
delete mechanism for mail if it receives > score XX. I've read all the 
doco about the preferred method being to setup filters and do it client 
side, but a number of clients of mine are getting a large amount of 
spam, and we've been watching what's been flagged as such over a 6 month 
period and there's been only 1 instance of a false positive (which was 
an exteremely spam like email anyway, so understandable) and the clients 
more than happy to take that risk. Going to keep his required_score at 5 
but want to auto-delete if it's above 8 or so. Any help would be greatly 
appreciated.

TIA