backport fix

- `INJECT_EMAIL_HOST_USER`: _string, default=""_ - Username to use for authentication to the SMTP server defined in _INJECT_EMAIL_HOST_.

- `INJECT_EMAIL_HOST_PASSWORD`: _string, default=""_ - Password to use for the SMTP server defined in _INJECT_EMAIL_HOST_. This setting is used in conjunction with _INJECT_EMAIL_HOST_USER_ when authenticating to the SMTP server.

- `INJECT_EMAIL_SENDER_ADDRESS`: _string, default=""_ - The sender address for automatic emails.

- `INJECT_EMAIL_PROTOCOL`: _string, default=None_ - Optional variable for defining the preferred protocol for communication with SMTP server. The choices (values) can be _ssl_ or _tls_ (case insensitive). This variable can also be left undefined - no encryption will be used.

- `INJECT_LOGS`: _string, default=backend-logs.log_ - Path to a file where to save logs.

- `INJECT_DOMAIN`: _string, default=""_ - Domain where yours instance of the INJECT is available.

- `INJECT_SECRET_KEY`: _string_ - Used to provide cryptographic signing. Must be at least 50 long characters string.

    EMAIL_PORT = 25

EMAIL_HOST_USER = os.environ.get("INJECT_EMAIL_HOST_USER", "")

EMAIL_HOST_PASSWORD = os.environ.get("INJECT_EMAIL_HOST_PASSWORD", "")

EMAIL_USE_SSL = True

EMAIL_SENDER_ADDRESS = os.environ.get("INJECT_EMAIL_SENDER_ADDRESS", "")

DOMAIN = os.environ.get("INJECT_DOMAIN", "")

if protocol := os.environ.get("INJECT_EMAIL_PROTOCOL"):

    formatted_protocol = protocol.lower().strip()

    if formatted_protocol == "tls":

        EMAIL_USE_TLS = True

    elif formatted_protocol == "ssl":

        EMAIL_USE_SSL = True

    else:

        raise Exception(

            f"Invalid SMTP protocol '{protocol}'. "

            f"Options are 'ssl', 'tls' or leave 'undefined' for unencrypted."

        )

# CORS settings

CORS_ALLOW_CREDENTIALS = True

CORS_ALLOWED_ORIGINS = [

from django.template.loader import render_to_string

from django.utils.html import strip_tags

from email.mime.image import MIMEImage

from common_lib.logger import logger

from user.models import User

from ttxbackend.settings import EMAIL_SENDER_ADDRESS, DOMAIN

        message.attach_alternative(html_content, "text/html")

        messages.append(message)

    connection = get_connection(fail_silently=True)

    try:

        connection = get_connection(fail_silently=False)

        connection.send_messages(messages)

    except Exception as e:

        logger.error(f"Failed to send credentials via SMTP server: {e}")

def send_password_change_notification(user: User):

from user.models import User, Tag, UserTag

from aai.models import UserGroup

from user.email.email_sender import send_credentials

from common_lib.logger import logger

TAG_DELIMITER = "|"

            if created_user is not None:

                created_users.append(created_user)

        logger.info(

            f"Users: {[new_user for new_user, _ in created_users]} were created."

        )

        if not settings.DEBUG and not settings.TESTING_MODE:

            send_credentials(created_users)

        return validator.result_handler.create_response()