redhat-config-network needs to restart the mail system when you change the hostname otherwise mail to the new name doesnt work until the baffled user power cycles the box. In addition I edited two interface configurations and did apply, but had to deactivate then reactivate them to get the new configurations
done in >= 1.1.87
new packages to test available at: ftp://people.redhat.com/harald/redhat-config-network/1.1.87-1/ ftp://people.redhat.com/harald/rhpl/0.74-2/