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 In Parallels H-Sphere 2.5.1 and up it is possible to allow third-level domain hosters to create e-mail resources under their service domains.
   I.e., users that host third-level domains user.domain.com under service DNS zone domain.com,
   will be able to create mailboxes like anything@domain.com
   from their user CP. 
To allow third-level hosters to create mailboxes under a service domain: 
    - Choose Manage in the Plans menu and check the Third level domain (Mail Under Host Domain) option for a plan:
        
  
     
    - Choose DNS Manager in the Settings menu and click the Off icon to enable the
        Allow creating emails under Service Zone option for a particular service domain:
        
  
     
 
Then, if you search by domain name in the Search menu, affected third-level domains will have the domain type
Third level domain (Mail Under Host Domain). 
                    
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