from django.core.mail import EmailMultiAlternatives
from django.template.loader import get_template
from django.template import Context
plaintext = get_template('email.txt')
htmly = get_template('email.html')
d = Context({ 'username': username })
subject, from_email, to = 'hello', 'from@example.com', 'to@example.com'
text_content = plaintext.render(d)
html_content = htmly.render(d)
msg = EmailMultiAlternatives(subject, text_content, from_email, [to])
msg.attach_alternative(html_content, "text/html")
msg.send()