I think this may be due to a typo in the install instructions. When Red Hat runs rc.local as the last step of the boot process, it chokes on a bad line break.
To get past this on boot, interrupt the boot process (I think by pressing "c") when prompted, and go through the services manually. The problem service is "local" - be sure not to run that. Once you've booted fully, edit /etc/rc.local and take out the qmail lines.
You can fix the problem by finding the typo in rc.local or by running qmail with daemontools. This is the recommended approach and I've documented it in the new version of the Install Guide.
