One user whitelisted, everyone gets the spam...

[mailscanner at herald.co.uk]

Hi folks,

MailScanner 4.60.8 using ClamAV...

For various long and dull reasons, we have a single user whose mail is 
not filtered by MailScanner; this is done by a "deliver" rule in a 
ruleset attached to Spam Actions.

Annoyingly (to the other users...) this is causing spam to leak through 
to them, if mail's sent to a bunch of people including this user (where 
a "bunch" is fewer than 20, that being what "Ignore Spam Whitelist If 
Recipients Exceed" is currently set to). The worst example I've seen so 
far is a spam scoring 165 getting through... our usual "delete" 
threshold is 12.

I thought about reducing the "Ignore Spam Whitelist" setting, but we do 
legitimately get emails in addressed to more users than these spams have 
been (12 - 15 users; the spams have been addressed to around 8 or so)

Is there a relatively straightforward way of stopping this user's 
settings from affecting anyone else? (Politics sadly dictates that 
insisting on filtering his mail in the same way as everyone else's is 
not a viable way forward.) 

Thanks

Mel