config.yml

email:
    host: server.example.com:465
    user: user@example.com
    pass: pass
    desti: desti@example.com

email.py

import yaml
from mailshake import SMTPMailer, EmailMessage

with open('config.yml', 'r') as ymlfile:
    config = yaml.load(ymlfile)

mailer = SMTPMailer(host=config['email']['host'], port=25, username=config['email']['user'], password=config['email']['pass'],
                 use_tls=None, use_ssl=None, timeout=5, max_recipients=200)

with open ('fitxer.txt', "r") as myfile:
    txt_body = myfile.read()

email_msg = EmailMessage(
    'Hi',
    'Hello world!',
    config['email']['user'],
    [config['email']['desti']]
)
email_msg.attach('nomfiter.txt',txt_body)
mailer.send_messages(email_msg)