"(unknown)" errors in mail.log for user name when running spamd on OS X

[Rob Kudyba <rk...@raeinternet.com>]

If I start spamd as user 'bruce' it writes to the mail.log, (for example):

"(unknown):54".  It correctly reports the number of the bruce account 
but it doesn't pickup the name associated with it.

I tried this with several different accounts and with each one, it reports
(unknown):[user number].

Or for example, if I start as user "nobody": /usr/bin/spamd -u nobody -d
You'll see logs like this:
Aug 25 20:14:56 G518X2 spamd[6491]: logmsg: identified spam (13.4/5.0) 
for (unknown):-2 in 0.3 seconds, 1482 bytes.

Aug 25 20:14:56 G518X2 spamd[6491]: identified spam (13.4/5.0) for 
(unknown):-2 in 0.3 seconds, 1482 bytes.

Note that -2 is the user number in /etc/passwd by default. Not sure why 
-2 is given as the user number either...

So, perhaps there's something wrong with the way spamd accesses the user 
info on OS X?

I don't see anything regarding this problem on the 
http://www.stupidfool.org/docs/sa.html page.