I’ve just finished updating all my servers with Security update 2009-001. Experience from the last updates made me check the postfix config for changes and yes there was the usual change to the config, luckily postfix itself wasn’t affected. To correct it comment out or delete the following line:
/etc/postifx/main.cf‘. Restart postfix (reloading config does not work) with:
sudo postfix start
On my production server sqlgrey didn’t start after a first reboot but I think that was a temporary glitch as it did work on my other servers and was easily started manually.
If you want to read more on what is affected in the updates I would suggest reading the Apple support site for the 2009-001 security update.
In case of doubt, please make a full bootable disk image backup with Cabon Copy Cloner before you start.