DCC not working?

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Hi,
I compiled DCC from sources on a mailscanner testbox, enabled it in the
spamassassin prefs file, and spamassassin --lint (-D) doesnt show a
a failure. But how do I know that DCC works? There are no header
changes, and, I dont see anything changed since I installed it.

Is there a good way to test? Or even to show the DCC headers?
Adding "add_header all DCC _DCCB_: _DCCR_" made no change, there
are still no headers...

Thank you,
Bastian