Spam with bogus spamassassin checks

[William D. Colburn]

We use MailScanner here, I'm at 4.85.2-3.  Spamassassin is at 3.4.1.
with razor agents 2.84.  We have spam leaking through that has bogus
looking spamassassin results:

  X-MailScanner: Found to be clean
  X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-0.01, required 5, autolearn=disabled, T_RP_MATCHES_RCVD -0.01)
  X-Spam-Status: No

If I manually run the spam message through spamassassin it is flagged
correctly as spam.   The messages are small, 2k or so, with nothing
weird in the headers that I can spot.

I've scanned the maillogs.  I've tried turning on all the various debug
options in MailScanner I could find.  Nothing has panned out.  These
emails continue to leak through with no indication of why.

Does anyone have any suggestions of where I should look?

----------------------------------------------------------------------
Also, your listserve's confirmation email was considered to be spam by
MailScanner.

X-MailScanner-Information: Please contact the postmaster at aoc.nrao.edu for more
        information
X-MailScanner: Found to be clean
X-MailScanner-SpamCheck: spam, SpamAssassin (score=5.651, required 5,
        autolearn=disabled, DKIM_SIGNED 0.10, RCVD_IN_DNSWL_LOW -0.70,
        TVD_SPACE_RATIO 0.00, TVD_SPACE_RATIO_MINFP 2.75,
        T_DKIM_INVALID 0.01, T_RP_MATCHES_RCVD -0.01, VIRUS_WARNING62
	3.50)
X-MailScanner-SpamScore: sssss
X-MailScanner-From: mailscanner-bounces at lists.mailscanner.info
X-Spam-Status: Yes

--Schlake