Emails Stopped Working (SSL cert verification issue)

Configuration
1

Not sure when this started, but email notifications through my automatons are no longer working. From the log file it seems to be an SSL cert verification issue, but not sure where to start digging into this problem. I have in the log file:

Logger: homeassistant.components.notify
Source: components/smtp/notify.py:144
Integration: Notifications (documentation, issues)
First occurred: 5:37:16 AM (4 occurrences)
Last logged: 5:45:32 AM

Error setting up platform smtp
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/notify/legacy.py", line 67, in async_setup_platform
    notify_service = await hass.async_add_executor_job(
  File "/usr/local/lib/python3.9/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 92, in get_service
    if mail_service.connection_is_valid():
  File "/usr/src/homeassistant/homeassistant/components/smtp/notify.py", line 154, in connection_is_valid
    server = self.connect()
  File "/usr/src/homeassistant/homeassistant/components/smtp/notify.py", line 144, in connect
    mail.starttls(context=ssl_context)
  File "/usr/local/lib/python3.9/smtplib.py", line 790, in starttls
    self.sock = context.wrap_socket(self.sock,
  File "/usr/local/lib/python3.9/ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "/usr/local/lib/python3.9/ssl.py", line 1040, in _create
    self.do_handshake()
  File "/usr/local/lib/python3.9/ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1129)
2

Added “verify_ssl: false” to the configuration.yaml file and it resolved my email problem. Not sure why this recently became a problem though.

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