I am unable to reproduce this on 3.11:

>>> with open(b'lkml-exception.mail', mode = 'r') as f:
...  msg = email.message_from_file(f, policy=email.policy.SMTP)
... 
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
AttributeError: module 'email' has no attribute 'policy'
>>> import email.policy
>>> with open(b'lkml-exception.mail', mode = 'r') as f:
...  msg = email.message_from_file(f, policy=email.policy.SMTP)
... 
>>> msg.get_all('to')
['unlisted-recipients:;, @pop.kundenserver.de']
>>>