[exim] Exim4 and SA: Overloading the system

    I am running exim4 with SA for 216 users in a network....The
configuration of my server is: P4 1.4GHz, 256 RAM and 40GB HD. And my
server is NEW, i´ve just finished configuring it last week, and it is
getting overloaded. The webmail takes too long to be loaded in a
browser, the mail akes too long to be delivered....and I dont have any
idea on how to tweak the performance better.