I realized that since my reboot last week that network tests are no longer running. Any hints on tracking down why? I'm stilling running 3.0, on Fedora Core 2 using spamd. SA is launched using spamc in /etc/procmailrc:
I'd start off simple...
spamassassin --lint -D
See what that can tell you. If that's showing network tests working, try adding -D to spamd's start up (note: spamd not spamc) and check your syslogs. (warning: this will dump lots of debug into your mail log)