# File common/lib/symbiosis/domain/dkim.rb, line 24
    def dkim_key
      return @dkim_key unless @dkim_key.nil?
      key = get_param("dkim.key", self.config_dir)

      @dkim_key = if key.is_a?(String)
        begin
          OpenSSL::PKey::RSA.new(key)
        rescue OpenSSL::OpenSSLError
          nil
        end
      else
        nil
      end
    end