    # File lib/action_mailer/vendor/tmail-1.2.3/tmail/address.rb, line 219
        def local
          return nil unless @local
          return '""' if @local.size == 1 and @local[0].empty?
          # Check to see if it is an array before trying to map it
          if @local.respond_to?(:map)
            @local.map {|i| quote_atom(i) }.join('.')
          else
            quote_atom(@local)
          end
        end