[Mimedefang] changing SA rules dir

[Anil]

I just found out my spam filtering isn't working properly, and it is
because I got the directories mis-configured.

I have spamassassin installed in /opt/coolstack.
Default rules are in /opt/coolstack/share/spamassassin

I run sa-update to pull new rules, and they go into:
/var/opt/spamassassin/3.002004

But it seems like mimedefang (or rather SA) isn't seeing the new
rules. They seem to keep using the rules in
/opt/coolstack/share/spamassasin.

How can I fix this?
I am a bit confused as what the definitions of
DEF_RULES_DIR
LOCAL_RULES_DIR
LOCAL_STATE_DIR

all mean.

Hope someone can help.

Thanks,
Anil