import smtplib
from email.message import EmailMessage
from typing import Dict

def send_email(cfg: Dict[str, str], subject: str, body: str) -> None:
    """
    Отправляет письмо через SMTP по настройкам из cfg.
    Ожидает ключи: host, port, username, password, from, to.
    """
    msg = EmailMessage()
    msg['Subject'] = subject
    msg['From']    = cfg['from']
    msg['To']      = cfg['to']
    msg.set_content(body)

    with smtplib.SMTP(cfg['host'], cfg['port']) as smtp:
        smtp.starttls()
        smtp.login(cfg['username'], cfg['password'])
        smtp.send_message(msg)