Add needs_response method to FilterProtocol

		self._optflags = ProtocolFlags(0)

		self._actflags = ActionFlags(0)

	def needs_response(self, message: MTAMessage) -> bool:

		"""

		Return whether the message from an MTA requires a response

		There answer to whether a response is required will rely in part on the options

		negotiated with the MTA.

		"""

		match message:

			case Negotiate():

				return True

			case Macro()|Abort()|Close():

				return False

		return message.ident not in self.nr

	def read_from(

		self,

		buf: FixedSizeBuffer,