With new installations of RHEL5 and Ensim X, there appears to be a common error during adding new domains.
The error you should receive is as follows.
/usr/bin/newaliases: error while loading shared libraries: libkeyutils.so.1: cannot open shared object file: No such file or directory\n
To resolve this, perform the following commands.
cp /lib/libkeyutils-1.2.so /home/virtual/FILESYSTEMTEMPLATE/siteinfo/lib/
cp /lib/libkeyutils-1.2.so /etc/virtualhosting/templates/siteinfo/lib/libkeyutils.so.1