ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif'}
MAX_FILE_SIZE = 5 * 1024 * 1024  # 5 MB

USE_EXTERNAL_SMTP = False
SMTP_SERVER = 'smtp.example.com'
SMTP_PORT = 587
SMTP_USE_TLS = True
SMTP_SENDER_EMAIL = 'your_email@example.com'
SMTP_SENDER_PASSWORD = 'your_email_password'