# Τεκμηρίωση του Django - 1.10.7

# Πηγαίος κώδικας για το django.core.mail

    """
    Tools for sending email.
    """
    from __future__ import unicode_literals

    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) settings.EMAIL_BACKEND is used.

        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 auth_user is None, the EMAIL_HOST_USER setting is used.
        If auth_password is None, the EMAIL_HOST_PASSWORD setting is used.

        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), sends
        each message to each recipient list. Returns the number of emails sent.

        If from_email is None, the DEFAULT_FROM_EMAIL setting is used.
        If auth_user and auth_password are set, they're used to log in.
        If auth_user is None, the EMAIL_HOST_USER setting is used.
        If auth_password is None, the EMAIL_HOST_PASSWORD setting is used.

        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):
        """Sends a message to the admins, as defined by the ADMINS setting."""
        if not settings.ADMINS:
            return
        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):
        """Sends a message to the managers, as defined by the MANAGERS setting."""
        if not settings.MANAGERS:
            return
        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)