Support LMTP about aiosmtplib HOT 3 OPEN

DEBUG:asyncio:Using selector: EpollSelector
DEBUG:asyncio:Get address info localhost:24, type=<SocketKind.SOCK_STREAM: 1>
DEBUG:asyncio:Getting address info localhost:24, type=<SocketKind.SOCK_STREAM: 1> took 1.631ms: [(<AddressFamily.AF_INET6: 10>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('::1', 24, 0, 0)), (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 24))]
DEBUG:asyncio:<asyncio.TransportSocket fd=6, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('127.0.0.1', 46574), raddr=('127.0.0.1', 24)> connected to localhost:24: (<_SelectorSocketTransport fd=6 read=polling write=<idle, bufsize=0>>, <aiosmtplib.protocol.SMTPProtocol object at 0x7fc8ab964550>)
DEBUG:asyncio:Close <_UnixSelectorEventLoop running=False closed=False debug=True>
ERROR:asyncio:Future exception was never retrieved
future: <Future finished exception=SMTPServerDisconnected('Connection lost') created at /usr/lib/python3.10/asyncio/base_events.py:429>
source_traceback: Object created at (most recent call last):
  File "/home/shi/Documents/aiosmtplib/main.py", line 25, in <module>
    asyncio.run(main())
  File "/usr/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.10/asyncio/base_events.py", line 636, in run_until_complete
    self.run_forever()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 603, in run_forever
    self._run_once()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1901, in _run_once
    handle._run()
  File "/usr/lib/python3.10/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/home/shi/Documents/aiosmtplib/main.py", line 18, in main
    await a.send_message(message)
  File "/home/shi/Documents/aiosmtplib/aiosmtplib/smtp.py", line 1424, in send_message
    return await self.sendmail(
  File "/home/shi/Documents/aiosmtplib/aiosmtplib/smtp.py", line 1301, in sendmail
    response = await self.data(message, timeout=timeout)
  File "/home/shi/Documents/aiosmtplib/aiosmtplib/smtp.py", line 894, in data
    return await self.protocol.execute_data_command(message, timeout=timeout)
  File "/home/shi/Documents/aiosmtplib/aiosmtplib/protocol.py", line 328, in execute_data_command
    response = await self.read_response(timeout=timeout)
  File "/home/shi/Documents/aiosmtplib/aiosmtplib/protocol.py", line 271, in read_response
    self._response_waiter = self._loop.create_future()
  File "/usr/lib/python3.10/asyncio/base_events.py", line 429, in create_future
    return futures.Future(loop=self)
aiosmtplib.errors.SMTPServerDisconnected: Connection lost