Read and Parse emails using POP3 in Python

read_pop3ssl_emails.py

import poplib, getpass, email
import re

Mailbox = poplib.POP3_SSL('mail.privateemail.com')
Mailbox.user('[email protected]')
Mailbox.pass_('pass')

emails = []
tries = 0
fail_tries = 300
subject = "Undelivered Mail Returned to Sender"
month = "Jul 2018"
not_found = 0
total_emails = 0

# Read dirty emails from emails.txt file
def read_emails():
    global emails, total_emails
    print('Reading dirty emails...')
    print('Script will exit after failing to read following Subject and Month \n\
in parsed emails ', fail_tries, 'times')
    print('Subject : ', subject, '\nMonth : ', month)
    with open('emails.txt', 'r') as f:
        emails = [line.strip() for line in f]
        total_emails = len(emails)
        
        
# Write filtered emails to clean_emails.txt file
def write_emails():
    global emails
    print('Writing clean emails to file...')
    file = open("clean_emails.txt","w")
    for email in emails:
        file.write(email+"\n")
    file.close()
    print('Done!')


# Total inbox messages
def get_total_emails():
    return len(Mailbox.list()[1])

# Parse emails from mail text and filter dirty emails
def filter_emails(total):
    global emails, tries, fail_tries, subject, month, not_found
    
    for i in reversed(range(total)):
        raw_email  = b"\n".join(Mailbox.retr(i+1)[1])
        parsed_email = email.message_from_bytes(raw_email)
        
        if subject in parsed_email["Subject"] and month in parsed_email["Date"]:
            
            payload = parsed_email.get_payload()[0]
            body = payload.get_payload()
            match = re.search(r'[\w\.-]+@[\w\.-]+', body)
            remove_email = match.group(0).lstrip()
            try:
                # print(parsed_email["Date"])
                # print(parsed_email["Subject"])
                # print('Remove', remove_email)
                emails.remove(remove_email)
            except:
                # print('Not Found', remove_email)
                not_found += 1
                pass
        else:
            tries += 1

        if tries > fail_tries:
            print('Exiting after failing', fail_tries, 'times')
            break

read_emails()
filter_emails(get_total_emails())
write_emails()
print('Total Emails Provided : ' , total_emails)
print('Filtered Emails : ', len(emails))
print('Emails not found in emails.txt file : ', not_found)