CGPSA

Hello,
am using CGPro as mail server, and i need some help and advice
I am planning to implement CGPSA on our ingate servers and am not quite
sure if it is a good idea
we recieve almost 7000 email per hour and i don't know if spamassassin
is going to miss anything
another question
for the amount of emails mentioned above am i supposed to configure
CGPSA as in HEADERS or FULL mode

any help on that regard will be appreciated
Thank you