How can I verify whether my system is really using DNSBLs?
If it's using them, many of your spams will show up with BL tests hitting in the header.
You can also take a nice juicy spam and feed it to spamassassin with the -D flag and watch the trace messages.
Best regards, Mojo -- Morris Jones Monrovia, CA http://www.whiteoaks.com Old Town Astronomers: http://www.otastro.org