unsub.py

import re

def add_unsubscribe(mails: List, unsub_links: dict = {}) -> dict:
    for mail in mails:
        #getting sender
        sender_line = mail.split('\n')[0]               #first line of the mail
        sender_words = sender_line.split(' ')[1:]       #removes the 'From: ' part
        sender = ' '.join(sender_words)                 #recreates the name string
        if 'Q?' in sender:
            sender = re.findall('.Q.?(.*?)\?', sender)[0]  #removing some char coding
        #getting unsubscribe links
        for line in mail.split('\n'):
            if 'List-Unsubscribe' in line and '<' in line:
                links = re.findall('<(.*?)>', line)
                url = mailto = None
                for link in links:
                    if link.startswith('https'):
                        url = link
                    elif link.startswith('mailto'):
                        mailto = link
                if any(links):
                    if sender in unsub_links:
                        unsub_links[sender]['count'] += 1
                    else:
                        unsub_links[sender] = {'count': 1, 'url': url, 
                                               'mailto': mailto}
    return unsub_links