Handle memoryviews in EnvelopeFrom and EnveleopRecipient messages

			while self.phase <= Phase.MAIL:

				message = await self._broadcast.receive()

				if isinstance(message, EnvelopeFrom):

					return message.sender.decode()

					return bytes(message.sender).decode()

		raise RuntimeError("MAIL event not received")

	async def envelope_recipients(self) -> AsyncIterator[str]:

			while self.phase <= Phase.ENVELOPE:

				message = await self._broadcast.receive()

				if isinstance(message, EnvelopeRecipient):

					yield message.recipient.decode()

					yield bytes(message.recipient).decode()

	async def extension(self, name: str) -> memoryview:

		"""