spamass-milter flags, where to include?

[Mooky Mooksgill]

I want to use the flag -r 15 for spamass-milter (to drop spam over a certain 
threshold).

Where should I include the flag?

I'm not sure how spamass-milter is invoked, it's either via sendmail's conf 
or the
/usr/local/etc/rc.d/spamass-milter.sh start script, or ???

Where does the rejected spam go?

Thanks,
-M

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