Examples: www.mydomain.com
                                subdomain.domain.com
                                domain.com
                              
                              Use * wildcard to match any subdomain or domain.
                              
                              For example:
                              shop.*.*
                              for your shop subdomain
                              
                              blog.mydomain.*
                              to match blog on all tld's
                              
                              *.mydomain.*
                              to match all subdomains and tld.
                              
                              Use
                              *.*.*
                              to match all other hosts.
                              
                              Must be unique for each site.