Hi, 

>    I am using Spamassassin on our SMTP servers with almost 20000 mails
> an hour. The problem is the machine is almost always heavily loaded.
> Spamassassin takes a lot of time and I think the Bayes checking /
> learning is the real cpu hog ? 
Depending on how much and how often you're learning, yes, it can be a 
hog. Lookups aren't expensive but depending on your backend
learning can hit you. At 20000 mails an hour, I'd check if you're using
auto learning of spam/ham and would seriously consider using a real
SQL RDBMS as a backend (MySQL/Postgres). 

> I would like to completely disable bayes , can someone provide some
> inputs on this.
Add the following to your local.cf (usually /etc/spamassassin/local.cf):
use_bayes 0

This will turn everything Bayes related.

Regs,
Sven

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