Jasper Spaans added the comment:
As can be seen above, 3.5 wraps the realname in a double quote, but 3.8 fails
to do so. Note that 3.5 also does not add a whitespace in front of the line
starting with "X:", so it is also not merged with the previous line when
parsing.
I guess we'll have to
New submission from Jasper Spaans :
big-bob:t spaans$ cat fak.py
import sys
from email.message import EmailMessage
from email.policy import SMTP
from email.headerregistry import Address
msg = EmailMessage(policy=SMTP)
a = Address(display_name='Extra Extra Read All About It This Line Does Not