amavisd-new not rewriting headers

["Cameron L. Spitzer" <cls@truffula.sj.ca.us>]

[This message has also been posted to linux.debian.isp.]

Postfix 2.3 on Sarge.  Current amavisd-new and spamassassin.
All current versions from upstream.
Postfix smtpd proxies incoming SMTP to amavisd, amavisd
adds its Received: headerfield and passes the message
to another smtpd that doesn't proxy.  Postfix queues
and delivers the mail.  This is the amavis before-queue
setup.  Loadaverage on the machine is 0.12.

@spam_tag_level_maps = (
  { 'cls@truffula.sj.ca.us' => -100.0 },
  \$sa_tag_level_deflt,
);

Everything else at default settings.  Mail goes through
and gets logged.  But no X-Spam headers are ever added
to the messages.  How can I troubleshoot this?
The sample config files are really great but there is
not much about what if it doesn't work.



Cameron