We went with GFI Mail Essentials and our SPAM has been reduced by 90%...it works great and is fairly cheap..it installs easily and works like a champ..
put the SMTP relay server on your class c subnet (192.168.0.0) and use NAT on Firewal to point to the outside (64.64.64.64) SMTP
i.e.,
static (inside,outside) 64.64.64.64 192.168.0.0 netmask 255.255.255.255 0 0
then make sure only port 25 is open for you outside IP. now you SMTP will live...
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