I’ve just installed the updates on all my test machines running Snow Leopard 10.6.7 and Leopard 10.5.8 before running it on my production server. I did a couple of tests on the machines and could not see an immediate problem on Snow Leopard. Therefore I’m happy to inform you that the Mac OS X 10.6.8 update does not introduce any problem for our setup.

The Security Update 2011-004 however does change Leopard. I’ve noticed that it replace the postfix binaries and adds Apple’s idea of a security feature to the configuration file. To correct the binaries, go to your latest postfix source directory from which you installed it last and run

sudo make install

For the changed configuration please comment out or delete the following line from ‘/etc/postfix/main.cf‘:

inet_interfaces = localhost

Restart postfix (reloading config does not work) with:

sudo postfix stop

Postfix should restart automatically (if not run “sudo postfix start”).

This is expected to be the last update before Lion and I’ve got everything lined up to test the upgrade to Lion and a new install on that same platform. I hope to be able to tell you what the results will be as soon as possible.