[Python] Python as of today returns errors re. smtp starttls

I have a Python script that sends email and until yesterday it just worked fine, and has been working fine for the last three years. As of today it no longer works and reports the errors below. Both Python version and the script itself did not change. Any clues what this is about?

Traceback (most recent call last):
File "C:\Users\te\TM1py\tm1py-samples-master-old\KT\test - Copy.py", line 81, in <module>
smtp.starttls()
File "C:\ProgramData\anaconda3\Lib\smtplib.py", line 790, in starttls
self.sock = context.wrap_socket(self.sock,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\ProgramData\anaconda3\Lib\ssl.py", line 517, in wrap_socket
return self.sslsocket_class._create(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\ProgramData\anaconda3\Lib\ssl.py", line 1075, in _create
self.do_handshake()
File "C:\ProgramData\anaconda3\Lib\ssl.py", line 1346, in do_handshake
self._sslobj.do_handshake()
FileNotFoundError: [Errno 2] No such file or directory

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