XPost: comp.os.ms-windows.networking.tcp-ip   
   From: bruce-usenet@noreplybicycle.synonet.comnoreply   
      
   glen herrmannsfeldt wrote:   
      
   > Better to have one official name with both A and PTR records,   
   > all the other names CNAME to that name.  Even with more than one   
   > A record, it works best to have only one PTR.   
      
   Except of course when the Name is being used as an MX destination, then it   
   must be an A record.   
      
   // The following is invalid and will result in most MTAs ignoring the target   
   // quite a few name servers will also give a warning if they see this   
      
   foo	in	a	1.2.3.4   
   mail	in	cname	a   
      
   @	in	mx	10 mail   
      
      
   // the proper way of doing it is:   
   foo	in	a	1.2.3.4   
   mail	in	a	1.2.3.4   
      
   @	in	mx	10 mail   
      
      
   There are other situations where cnames won't work (eg NS records) so you   
   should be careful when using them.   
      
   Bruce   
      
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