I was trying to determine why some obvious spam had no SA headers
attached to it.  Eventually I ran spamd and spamc as root as what 
I believe my mailer is doing (I am using the qmail/qmail-scanner
set up described at http://qmail-scanner.sourceforge.net/FAQ.php)

Running as root:
/usr/bin/spamd -L -x -a -D

Also running as root:
/usr/bin/spamc -d localhost < /tmp/spam.mail

I'll try to attach the spam.mail to this message.

What happens when I do this is that spamc returns 0/0, which
I gather means an error has occurred.

And spamd -D?  Eventually that spits out:

logmsg: connection from localhost.localdomain [127.0.0.1] at port 37033
logmsg: Still running as root: user not specified with -u, not found, or set to
root.  Fall back to nobody.
logmsg: checking message
<CAPRESUBNT2hhOjcdEc000015b4@capresubnt2.capresub.gov.co> for root:99, expecting
1589 bytes.
logmsg: bad protocol: header error: (Content-length mismatch: 1589 vs. 1580)