I have a little exchange box I play with and host a few mailboxes on. It's Server 2012 R2 hosting Exchange 2013 CU6.
I'm using the builtin spam settings and I have it set really tight, like 4 to delete, 3 to NDR as spam and 2 to send to my junk mail folder in outlook. I am also using spamcop and spamhaus RBLs and I still get a lot of spam.
Share your thoughts in what the settings should be, what all can be done using just the builtin stuff and maybe I'll come up with a better setup than I have right now.