Mine

UMASK="117"
if ( $SIZE < 26144 )
{
    exception {
       xfilter "/usr/local/bin/spamassassin --prefspath=$HOME/$DEFAULT/.spamassassin/user_prefs "
    }
}

if (/^X-Spam-Flag: *YES/)
{
    exception {
        to "$HOME/$DEFAULT/Spam/"
    }
}
else
{
    exception {
        to "$HOME/$DEFAULT"
    }
}