: >The zone administrator (or DNS spoofer) can redirect all root mail, by
   : >adding a zone entry "localhost.dom.ain." that points to some other
   : >place than 127.0.0.1.  Is this considered a feature?
   :
   : that doesn't matter.  that will only be looked for if "localhost" by
   : itself is not found.
   
   ...and even that case can be cared for by using "root@localhost." (note
   trailing dot, which tells the resolver that search domains must not be
   used).


except that the address "root@localhost." is invalid.


.mrg.