Example: Using signals to send email

signals_example.py

# I have not tested, only didactic.
#

# signals.py
#
from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string

def send_notification_mail(sender, instance, raw, using):
    context = {}
    
    subject = "Subject" 
    text_content = "Text content"
    from_email = "admin <admin@mydomain.com>"
    to = [instance.email]
    html_body = render_to_string('email.html', context)

    mail = EmailMultiAlternatives(subject, text_content, from_email, [to])
    mail.attach_alternative(html_body, "text/html")
    mail.send()

# models.py
#

from django.db import models
from signals import send_notification_mail

class PeopleModel(models.Model):
    name = models.CharField(max_length=255)
    email = models.EmailField()


models.signals.pre_save.connect(send_notification_mail, sender=PeopleModel)