import smtplib
import threading

from django.core.mail.backends.base import BaseEmailBackend

class EmailBackend(BaseEmailBackend):
    host: str = ...
    port: int = ...
    username: str = ...
    password: str = ...
    use_tls: bool = ...
    use_ssl: bool = ...
    timeout: int | None = ...
    ssl_keyfile: str | None = ...
    ssl_certfile: str | None = ...
    connection: smtplib.SMTP_SSL | smtplib.SMTP | None = ...
    _lock: threading.RLock = ...