SA3: DNSBLs stop working?

[Jay Levitt]

I'm running SA3.0.0-pre2 on Mandrake Linux 9.0 from within MIMEDefang 
2.44.  Occasionally, I am seeing e-mails get through without any DNSBL 
checking; if I immediately run spamassassin -t on them, it does see the 
RBLs and the rules fire.  It seems odd that I would suddenly and 
temporarily be unable to get through to ANY of them unless I was having 
network outages, and I've seen no evidence that that's the case. 

What could be causing this, and how can I troubleshoot?  I remember a 
bug a few versions ago that could cause this but I also remember it 
being fixed...

Is there any way to get myself sent a test e-mail from a site on one of 
the BLs?  This would be a useful tool to verify that I'm processing mail 
through the RBLs.

Is there a way to get SA to log the rules firing for each e-mail?  I 
suppose it's possible that I am actually NEVER checking RBLs on 
production mail; right now I have SIEVE set to delete anything over 10, 
and I think the scores would end up higher than that..

Jay Levitt