EmailMessage may lack Mime-Version

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-03-28.12:26:22.215>
labels = ['type-bug', 'expert-email', '3.10', '3.9']
title = 'EmailMessage may lack Mime-Version'
updated_at = <Date 2022-03-28.12:26:22.215>
user = 'https://bugs.python.org/VlastimilZma'

bugs.python.org fields:

activity = <Date 2022-03-28.12:26:22.215>
actor = 'Vlastimil.Z\xc3\xadma'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['email']
creation = <Date 2022-03-28.12:26:22.215>
creator = 'Vlastimil.Z\xc3\xadma'
dependencies = []
files = []
hgrepos = []
issue_num = 47141
keywords = []
message_count = 1.0
messages = ['416163']
nosy_count = 3.0
nosy_names = ['barry', 'r.david.murray', 'Vlastimil.Z\xc3\xadma']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue47141'
versions = ['Python 3.9', 'Python 3.10']