After updating ISPConfig to the latest release yesterday, I'm having this problem again. It seems like everytime I update the release it does not rebuild the postfix usertable properly. Following the udpdate I had to run: postmap /etc/postfix/virtusertable and then restart postfix. Then last night when ispconfig did it's normal maintenance it broke again. A customer called this morning and sure enough I had to run the postmap command again. How can I prevent this from happening? Am I going to have to schedule a cron job for right after ispconfig maintenance to do this?