old_contents: from django.conf import settings
  from django.core.mail import get_connection
  from django.core.mail.message import EmailMultiAlternatives
  
  NO_HTML_EMAIL_MESSAGE = """
  Your email client is trying to display the plaintext version of an email that
  is only supported in HTML. Please set your email client to display this message
  in HTML, or use an email client that supports HTML emails.
  """
  
  def send_HTML_email(subject, recipient, html_content, text_content=None, cc=None, email_from=None):
      if not text_content:
          text_content = getattr(settings, 'NO_HTML_EMAIL_MESSAGE',
                                 NO_HTML_EMAIL_MESSAGE)
  
      # If you get the return_path header wrong, this may impede mail delivery. It appears that the SMTP server
      # has to recognize the return_path as being valid for the sending host. If we set it to, say, our SMTP
      # server, this will always be the case (as the server is explicitly serving the host).
      if email_from is None:
          #todo: verify that this is even necessary here since it seems like email_return_path == email_from
          email_return_path = getattr(settings, 'EMAIL_RETURN_PATH', None)
          if email_return_path is None:
              email_return_path = settings.EMAIL_LOGIN
  
          email_from = getattr(settings, 'EMAIL_FROM', None)
          if email_from is None:
              email_from = email_return_path
      else:
          email_return_path = email_from
  
      from_header = {'From': email_from}  # From-header
      connection = get_connection()
      
      msg = EmailMultiAlternatives(subject, text_content, email_return_path, [recipient], headers=from_header, connection=connection, cc=cc)
      msg.attach_alternative(html_content, "text/html")
      msg.send()
  
new_contents: from django.conf import settings
  from django.core.mail import get_connection
  from django.core.mail.message import EmailMultiAlternatives
  
  NO_HTML_EMAIL_MESSAGE = """
  Your email client is trying to display the plaintext version of an email that
  is only supported in HTML. Please set your email client to display this message
  in HTML, or use an email client that supports HTML emails.
  """
  
  def send_HTML_email(subject, recipient, html_content, text_content=None, cc=None, email_from=None, excel_files=None):
      if not text_content:
          text_content = getattr(settings, 'NO_HTML_EMAIL_MESSAGE',
                                 NO_HTML_EMAIL_MESSAGE)
  
      # If you get the return_path header wrong, this may impede mail delivery. It appears that the SMTP server
      # has to recognize the return_path as being valid for the sending host. If we set it to, say, our SMTP
      # server, this will always be the case (as the server is explicitly serving the host).
      if email_from is None:
          #todo: verify that this is even necessary here since it seems like email_return_path == email_from
          email_return_path = getattr(settings, 'EMAIL_RETURN_PATH', None)
          if email_return_path is None:
              email_return_path = settings.EMAIL_LOGIN
  
          email_from = getattr(settings, 'EMAIL_FROM', None)
          if email_from is None:
              email_from = email_return_path
      else:
          email_return_path = email_from
  
      from_header = {'From': email_from}  # From-header
      connection = get_connection()
      msg = EmailMultiAlternatives(subject, text_content, email_return_path, [recipient], headers=from_header, connection=connection, cc=cc)
      for file in excel_files:
          if file:
              msg.attach(file["title"], file["file_obj"].getvalue(), file["mimetype"])
      msg.attach_alternative(html_content, "text/html")
      msg.send()
subject: support for email-attachments