Django Email with Premailer

gistfile1.py

from premailer import Premailer

from django.conf import settings
from django.core.mail import EmailMultiAlternatives

from django.dispatch import receiver, Signal
from django.shortcuts import get_object_or_404
from django.template import loader
from django.template.loader import get_template
from django.contrib.auth.models import User

from .utils import get_mailchimp_api

"""
Dont copy and paste, this is just a guide on how to use Django
Signals, EmailMultiAlternatives and Premailer together. 
"""


welcome_notification = Signal(providing_args=['user_id'])

@receiver(welcome_notification)
def send_welcome_notificatoin(sender, user_id, **kwargs):
    user = get_object_or_404(User, pk=user_id)
    user_email = user.email
    context_dict = {
        'user': user,
    }

    subject_template_name = 'email/welcome-notification-subject.txt'
    subject = loader.render_to_string(
        subject_template_name, context_dict
    )
    subject = ''.join(subject.splitlines())
    from_email = settings.SUPPORT_FROM_EMAIL
    template_url = 'email/welcome-notification-email.html'
    html_template = get_template(template_url)
    html_content = Premailer(
        html_template.render(context_dict),
        base_url=settings.SITE_URL,
        remove_classes=False,
        strip_important=False
    ).transform()
    email = EmailMultiAlternatives(
        subject,
        '',
        from_email,
        [user_email]
    )
    email.attach_alternative(html_content, 'text/html')
    email.send()