The mailing list for listmasters using Sympa

["Jeff Abbott" <address@concealed>]

Folks,

We, like many sites, use an external spam filtering and tagging tool  
(specifically, Sophos PureMessage) running on our mail gateways that  
handles the identification and tagging of spam and viruses.  While some  
viruses are immediately quarantined at the gateway, no spam is ever  
blocked then and there, though most users have their mail filters for  
their Duke email accounts set up to abandon anything that's 80%+ likely to  
be spam, and some even drop anything 50% and above.  PureMessage tags  
messages that it thinks are 30%+ likely like so:

  X-PerlMx-Spam: Gauge=XXXXXXII, Probability=62%,  
Report='OBFU_CLASS_FINANCIAL_LOW 3, RCVD_IN_CBL 3'

(The Report='.....' part is usually much longer, but I cut it short to  
keep it readable.)

List owners, understandably, don't like it when spam makes it to their  
list, even if their users are eventually filtering it out.  While I could  
set up a bunch of scenarios for filtering different levels of spam with  
something like (to block 50% or higher):

  match([msg_header->X-PerlMx-Spam], /Gauge=X{5,10}/) -> reject,quiet

I'd rather not have to create an abundance of scenario files just for  
filtering different thresholds of spam.  Is there another way to do this?   
It'd be ideal to have it be completely and easily configurable by list  
owners, but if it requires Listmaster intervention I suppose that's okay  
so long as it works and doesn't require us to maintain a huge number of  
scenarios.  Thoughts?  Anyone else solved a similar problem, or looking  
for a solution to a similar problem?

Thanks,
Jeff