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mxcheck ( <TRUE>|<FALSE> )
   Specifies whether addresses passed to address() should
   be checked for a valid DNS entry.  The default is
   false.

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  If an error is encountered, an exception is raised.  This
  is really only possible when performing DNS queries.  Trap
...
                                     -mxcheck => 1 );
       };
       warn "an error was encountered: $@" if $@;