Bad headers not bouncing

[Bruce Pennypacker]

I just set up amavisd 2.9.0 on a CentOS server running postfix 2.6.6.  For
the most part things appear to be working properly, however I'm having an
issue where spams with a bad header are making it through.  All the spams
in question have headers similar to this:

X-Quarantine-ID: <ML1NQ4CCLqQY>
X-Virus-Scanned: amavisd-new at <mydomain>
X-Amavis-Alert: BAD HEADER SECTION, Missing required header field: "Date"
X-Spam-Flag: NO
X-Spam-Score: 0
X-Spam-Level:
X-Spam-Status: No, score=x tagged_above=-9999 required=6.2 tests=[]

In my amavisd.conf file I have:

$final_bad_header_destiny = D_BOUNCE;

Why are these spams being delivered and not bounced?  I must be
missing something but I'm not sure what.

Thanks,

-Bruce
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