This function is designed to parse an email message using the built-in Python module email.

parse_email_message.py

######################################################################################
# The re module is part of the standard Python library which regular expression 
# matching operations similar to those found in Perl.
######################################################################################
import re as regex

######################################################################################
# The email module is part of the standard Python library which provides 
# functions for reading, writing, and sending simple email messages.
#
# email.header.decode_header - decodes a message header value without converting the 
# character set
#
# ref: https://python.readthedocs.io/en/stable/library/email.html#module-email
######################################################################################
import email
from email.header import decode_header


def expunge_doublespaces(raw_string):
    """
    This function is designed to remove all double spaces
    from the input string. 
    :param raw_string: string to clean
    :return: clean string
    """
    if '  ' not in raw_string:
        return raw_string
    return expunge_doublespaces(raw_string.replace('  ', ' '))
    

raw_message = r"""Message-ID: <12626409.1075857596370.JavaMail.evans@thyme>
Date: Tue, 17 Oct 2000 10:36:00 -0700 (PDT)
From: john.arnold@enron.com
To: jenwhite7@zdnetonebox.com
Subject: Re: Hi
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-From: John Arnold
X-To: "Jennifer White" <jenwhite7@zdnetonebox.com> @ ENRON
X-cc: 
X-bcc: 
X-Folder: \John_Arnold_Dec2000\Notes Folders\'sent mail
X-Origin: Arnold-J
X-FileName: Jarnold.nsf

So, what is it?   And by the way, don't start with the excuses.   You're 
expected to be a full, gourmet cook.

Kisses, not music, makes cooking a more enjoyable experience.  


"Jennifer White" <jenwhite7@zdnetonebox.com> on 10/17/2000 04:19:20 PM
To: jarnold@enron.com
cc:  
Subject: Hi


I told you I have a long email address.

I've decided what to prepare for dinner tomorrow.  I hope you aren't
expecting anything extravagant because my culinary skills haven't been
put to use in a while.  My only request is that your stereo works.  Music
makes cooking a more enjoyable experience.

Watch the debate if you are home tonight.  I want a report tomorrow...
Jen

"""

email_message = email.message_from_string(raw_message)
message_id, message_id_encoding = decode_header(email_message["Message-ID"])[0]
date_sent, date_encoding = decode_header(email_message["Date"])[0]
sender, sender_encoding = decode_header(email_message["From"])[0]
x_sender, sender_encoding = decode_header(email_message["X-From"])[0]
recipient, recipient_encoding = decode_header(email_message["To"])[0]
x_recipient, recipient_encoding = decode_header(email_message["X-To"])[0]
subject, subject_encoding = decode_header(email_message["Subject"])[0]
for part in email_message.walk():
    content_type = part.get_content_type()
    if content_type == "text/plain":
        email_body = part.get_payload(decode=True).decode()
        # this regex removes:
        # "Jennifer White" <jenwhite7@zdnetonebox.com> on 10/17/2000 04:19:20 PM
        # To: jarnold@enron.com
        # cc:
        # Subject: Hi
        first_cleaning = regex.sub(r"((\W\w+\W).*(\d{2}:\d{2}:\d{2})\s(AM|PM)\n(To:.*)\n(cc:.*)\n(Subject:.*))",
                                   r' ', email_body)
        clean_body = expunge_doublespaces(first_cleaning.replace('\n', ' '))
        print(clean_body)