EmailMultiAlternatives doesn't render unicode html well

[anonymous]

The following code doesn't render the HTML message well

from django.core.mail import EmailMultiAlternatives
from django.template import Context, Template

test_string = u'éàèèèççççaaaa'


t = Template("Here is a string {{ test_string }}.")
c = Context({"test_string": test_string })

message_html = t.render(c)

subject, from_email, to = 'hello', 'from@example.com', 'to@example.com'
text_content = u'Here is a string %s' % test_string
html_content = message_html
msg = EmailMultiAlternatives(subject, text_content, from_email, [to])
msg.attach_alternative(html_content, "text/html")
msg.send()

Text message is OK but the HTML is not