My system seems to be running perfectly. I can send and receive mail. zmcontrol status shows everything as up. However in my logs I get:
Aug 20 09:58:30 claven2 postfix/postqueue: fatal: Queue report unavailable - mail system is down
Aug 20 09:59:00 claven2 postfix/postqueue: fatal: Queue report unavailable - mail system is down
every 30 seconds. No other postfix is running that I can see (launchd postfix disabled).
OS x 10.5.4
2.5 GB RAM