core: SMTP Component: STARTTLS won't work after upgrade to 2024.1/2024.1.1

The problem

Get an error if an automation sends an email with SMTP if i use starttls

configuration.yaml:

notify:
  - platform: smtp
    name: smtp
    sender: info@zoomsoft.de
    recipient: []
    server: server.zoomsoft.de
    port: 25
    encryption: starttls
    sender_name: Home Assistant
    debug: true
    verify_ssl: true

LOG:

2024-01-06 12:56:36.251 ERROR (MainThread) [homeassistant.components.automation.eingang_ug_kamera_e_mail] While executing automation automation.eingang_ug_kamera_e_mail
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/automation/__init__.py", line 669, in async_trigger
    await self.action_script.async_run(
  File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 1587, in async_run
    return await asyncio.shield(run.async_run())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 426, in async_run
    await self._async_step(log_exceptions=False)
  File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 479, in _async_step
    self._handle_exception(
  File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 502, in _handle_exception
    raise exception
  File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 476, in _async_step
    await getattr(self, handler)()
  File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 713, in _async_call_service_step
    response_data = await self._async_run_long_action(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/script.py", line 675, in _async_run_long_action
    return long_task.result()
           ^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/core.py", line 2149, in async_call
    response_data = await coro
                    ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/core.py", line 2186, in _execute_service
    return await target(service_call)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/notify/legacy.py", line 265, in _async_notify_message_service
    await self.async_send_message(**kwargs)
  File "/usr/src/homeassistant/homeassistant/components/notify/legacy.py", line 241, in async_send_message
    await self.hass.async_add_executor_job(
  File "/usr/local/lib/python3.11/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/smtp/notify.py", line 223, in send_message
    return self._send_email(msg, recipients)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/smtp/notify.py", line 227, in _send_email
    mail = self.connect()
           ^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/smtp/notify.py", line 154, in connect
    mail.starttls(context=ssl_context)
  File "/usr/local/lib/python3.11/smtplib.py", line 790, in starttls
    self.sock = context.wrap_socket(self.sock,
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/ssl.py", line 517, in wrap_socket
    return self.sslsocket_class._create(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/ssl.py", line 1108, in _create
    self.do_handshake()
  File "/usr/local/lib/python3.11/ssl.py", line 1379, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL] unknown error (_ssl.c:1006)

If i use encrytion: none it works.

What version of Home Assistant Core has the issue?

core-2024.1.1

What was the last working version of Home Assistant Core?

core-2023.12.x

What type of installation are you running?

Home Assistant OS

Integration causing the issue

SMTP

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response