SpamAssassin Scalability issues in Enterprise environments......

[Forrest Aldrich]

I've been asked to design a fairly large email gatewaying system, for 
which antispam measures are required.   I'd like to hear from others 
about any issues notes etc regarding scaling SpamAssassin to this sort 
of level... hardware requirements, kernel tuning (I'm using FreeBSD), 
good and bad issues, perhaps even commercial alternatives.

Thanks.