[IMail Forum] Rules performance hit

[Mark Kahn]

I was wondering if anyone could tell me how much of a performance hit the rules make on imail.  I currently have a fairly long rules file (200 rules or so) that's filtering a lot of spam for me and a few other users (1 domain, about 10 users).  We're getting a lot of requests to filter spam on other domains (about 3,000 users total in roughly 50 domains) and I'm just worried that imail might max the CPU if I add these rules to all the domains...any insights?   Thanks, -Mark