How do I know that DCC is working?

[Scott Friedman]

I have DCC installed and running on my Linux box, running Postfix and 
using Amavisd-new to query SA.

In my local.cf file, I have
use_dcc 1
dcc_timeout 10
dcc_add_header 1
use_razor2 1
razor_timeout 10


But if I grep my amavis logs for dcc and/or Razor, I don't see 
anything...  I think I might not be using these properly...

How do I determine if I am, and is my local.cf configured properly?