django-registration へのパッチ適用を回避するには、RegistrationProfile モデルをproxy=Trueで拡張する必要があります。
models.py
class HtmlRegistrationProfile(RegistrationProfile):
class Meta:
proxy = True
def send_activation_email(self, site):
"""Send the activation mail"""
from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string
ctx_dict = {'activation_key': self.activation_key,
'expiration_days': settings.ACCOUNT_ACTIVATION_DAYS,
'site': site}
subject = render_to_string('registration/activation_email_subject.txt',
ctx_dict)
# Email subject *must not* contain newlines
subject = ''.join(subject.splitlines())
message_text = render_to_string('registration/activation_email.txt', ctx_dict)
message_html = render_to_string('registration/activation_email.html', ctx_dict)
msg = EmailMultiAlternatives(subject, message_text, settings.DEFAULT_FROM_EMAIL, [self.user.email])
msg.attach_alternative(message_html, "text/html")
msg.send()
また、登録バックエンドでは、 RegistrationProfileの代わりにHtmlRegistrationProfileを使用してください。