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. Therefore I’m happy to inform you that the Mac OS X 10.6.7 update does not introduce any problem for our setup.

The Security Update 2011-001 however does change something on Leopard. I’ve noticed that it adds apple’s idea of a security feature to the configuration file. To correct it 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”).