# File lib/mail/header.rb, line 88
    def fields=(unfolded_fields)
      @fields = Mail::FieldList.new
      warn "Warning: more than #{self.class.maximum_amount} header fields only using the first #{self.class.maximum_amount}" if unfolded_fields.length > self.class.maximum_amount
      unfolded_fields[0..(self.class.maximum_amount-1)].each do |field|

        field = Field.new(field, nil, charset)
        field.errors.each { |error| self.errors << error }
        if limited_field?(field.name) && (selected = select_field_for(field.name)) && selected.any? 
          selected.first.update(field.name, field.value)
        else
          @fields << field
        end
      end

    end