From: barmar@alum.mit.edu   
      
   In article ,   
    EJP  wrote:   
      
   > Barry Margolin wrote:   
   > > That doesn't seem to be what tiger.com.au resolves to, though.   
   >   
   > Thanks Barry but it's tigers.com.au.   
      
   Oops.   
      
   Sometimes companies put useless A records on their domain name as an   
   anti-spam measure.  I think there are some spambots that send to the A   
   record rather than the MX record, so putting 0.0.0.0 or 127.0.0.1 in the   
   A record will prevent them from sending to you.   
      
   Another strange thing you see sometimes is an MX record that points to   
   ".".  Companies do this to indicate explicitly that mail shouldn't be   
   sent to that domain.  If they leave out the MX record, mail senders will   
   fall back to the A record, and they don't want all those useless SMTP   
   connection attempts.   
      
   --   
   Barry Margolin, barmar@alum.mit.edu   
   Arlington, MA   
   *** PLEASE don't copy me on replies, I'll read them in the group ***   
      
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