def get_email_headers(self):
        raise NotImplementedError  # Must be implemented by class using mixin
True if the session transport is encrypted, False otherwise.
dataset/ETHPy150Open Nomadblue/django-nomad-notifier/notifier/models.py/NotificationMixin.get_email_headers--crossover with--dataset/ETHPy150Open slimta/python-slimta/slimta/smtp/server.py/Server.encrypted