send mail via command line with t-online mail

#!/usr/bin/env python3
import sys
import smtplib
from argparse import ArgumentParser
from configparser import ConfigParser
from email.message import EmailMessage
from pathlib import Path


def make_mail(body, subject, to_, creds):
    msg = EmailMessage()
    msg.set_content(body)
    msg['Subject'] = subject
    msg['From'] = creds['email']
    msg['To'] = to_
    return msg


def send(message, creds, debug=False, verbose=False):
    with smtplib.SMTP(creds['host'], creds['port']) as smtp:
        if verbose:
            smtp.set_debuglevel(1)
        code, reply = smtp.starttls()
        if debug:
            print(reply.decode(), file=sys.stderr)
        code, reply = smtp.login(creds['user'], creds['password'])
        if debug:
            print(reply.decode(), file=sys.stderr)
        smtp.send_message(message)


def load_config():
    script_path = Path(sys.argv[0]).absolute().parent
    config_name = '.email-creds'
    config = script_path / config_name
    cfg = ConfigParser()
    if config.exists():
        cfg.read([config])
        return cfg
    else:
        cfg['email'] = {
            'host': 'securesmtp.t-online.de',
            'port': 587,
            'timeout': 5,
            'email': 'email@domain.tld',
            'user': 'email@domain.tld',
            'password': 'not set',
            }
        with config.open('w') as fd:
            cfg.write(fd)
            print('Written config to', config, file=sys.stderr)
            print('Change the settings inside this config and execute the program again', file=sys.stderr)
        return None


def main(message, subject, to, debug=False, verbose=False):
    cfg = load_config()
    if cfg is None:
        sys.exit(1)
    msg = make_mail(message, subject, to, cfg['email'])
    send(msg, cfg['email'], debug, verbose)


if __name__ == '__main__':
    parser = ArgumentParser()
    parser.add_argument('message', help="Message you want to send")
    parser.add_argument('subject', help="The subject of the message")
    parser.add_argument('to', help="Receiver of the e-mail")
    parser.add_argument('-d', '--debug', action='store_true', help='Show debug info about login and starttls.')
    parser.add_argument('-v', '--verbose', action='store_true', help='Show messages form smtp server')
    args = parser.parse_args()
    main(**vars(args))