# documentação Django 4.0.8.dev20220803071047

# Código fonte para django.core.mail

    """
    Tools for sending email.
    """
    from django.conf import settings

    # Imported for backwards compatibility and for the sake
    # of a cleaner namespace. These symbols used to be in
    # django/core/mail.py before the introduction of email
    # backends and the subsequent reorganization (See #10355)
    from django.core.mail.message import (
        DEFAULT_ATTACHMENT_MIME_TYPE,
        BadHeaderError,
        EmailMessage,
        EmailMultiAlternatives,
        SafeMIMEMultipart,
        SafeMIMEText,
        forbid_multi_line_headers,
        make_msgid,
    )
    from django.core.mail.utils import DNS_NAME, CachedDnsName
    from django.utils.module_loading import import_string

    __all__ = [
        "CachedDnsName",
        "DNS_NAME",
        "EmailMessage",
        "EmailMultiAlternatives",
        "SafeMIMEText",
        "SafeMIMEMultipart",
        "DEFAULT_ATTACHMENT_MIME_TYPE",
        "make_msgid",
        "BadHeaderError",
        "forbid_multi_line_headers",
        "get_connection",
        "send_mail",
        "send_mass_mail",
        "mail_admins",
        "mail_managers",
    ]

    def get_connection(backend=None, fail_silently=False, **kwds):
        """Load an email backend and return an instance of it.

        If backend is None (default), use settings.EMAIL_BACKEND.

        Both fail_silently and other keyword arguments are used in the
        constructor of the backend.
        """
        klass = import_string(backend or settings.EMAIL_BACKEND)
        return klass(fail_silently=fail_silently, **kwds)

    def send_mail(
        subject,
        message,
        from_email,
        recipient_list,
        fail_silently=False,
        auth_user=None,
        auth_password=None,
        connection=None,
        html_message=None,
    ):
        """
        Easy wrapper for sending a single message to a recipient list. All members
        of the recipient list will see the other recipients in the 'To' field.

        If from_email is None, use the DEFAULT_FROM_EMAIL setting.
        If auth_user is None, use the EMAIL_HOST_USER setting.
        If auth_password is None, use the EMAIL_HOST_PASSWORD setting.

        Note: The API for this method is frozen. New code wanting to extend the
        functionality should use the EmailMessage class directly.
        """
        connection = connection or get_connection(
            username=auth_user,
            password=auth_password,
            fail_silently=fail_silently,
        )
        mail = EmailMultiAlternatives(
            subject, message, from_email, recipient_list, connection=connection
        )
        if html_message:
            mail.attach_alternative(html_message, "text/html")

        return mail.send()

    def send_mass_mail(
        datatuple, fail_silently=False, auth_user=None, auth_password=None, connection=None
    ):
        """
        Given a datatuple of (subject, message, from_email, recipient_list), send
        each message to each recipient list. Return the number of emails sent.

        If from_email is None, use the DEFAULT_FROM_EMAIL setting.
        If auth_user and auth_password are set, use them to log in.
        If auth_user is None, use the EMAIL_HOST_USER setting.
        If auth_password is None, use the EMAIL_HOST_PASSWORD setting.

        Note: The API for this method is frozen. New code wanting to extend the
        functionality should use the EmailMessage class directly.
        """
        connection = connection or get_connection(
            username=auth_user,
            password=auth_password,
            fail_silently=fail_silently,
        )
        messages = [
            EmailMessage(subject, message, sender, recipient, connection=connection)
            for subject, message, sender, recipient in datatuple
        ]
        return connection.send_messages(messages)

    def mail_admins(
        subject, message, fail_silently=False, connection=None, html_message=None
    ):
        """Send a message to the admins, as defined by the ADMINS setting."""
        if not settings.ADMINS:
            return
        if not all(isinstance(a, (list, tuple)) and len(a) == 2 for a in settings.ADMINS):
            raise ValueError("The ADMINS setting must be a list of 2-tuples.")
        mail = EmailMultiAlternatives(
            "%s%s" % (settings.EMAIL_SUBJECT_PREFIX, subject),
            message,
            settings.SERVER_EMAIL,
            [a[1] for a in settings.ADMINS],
            connection=connection,
        )
        if html_message:
            mail.attach_alternative(html_message, "text/html")
        mail.send(fail_silently=fail_silently)

    def mail_managers(
        subject, message, fail_silently=False, connection=None, html_message=None
    ):
        """Send a message to the managers, as defined by the MANAGERS setting."""
        if not settings.MANAGERS:
            return
        if not all(isinstance(a, (list, tuple)) and len(a) == 2 for a in settings.MANAGERS):
            raise ValueError("The MANAGERS setting must be a list of 2-tuples.")
        mail = EmailMultiAlternatives(
            "%s%s" % (settings.EMAIL_SUBJECT_PREFIX, subject),
            message,
            settings.SERVER_EMAIL,
            [a[1] for a in settings.MANAGERS],
            connection=connection,
        )
        if html_message:
            mail.attach_alternative(html_message, "text/html")
        mail.send(fail_silently=fail_silently)