An example of sending a password reset email in django as a class-based email.

emails.py

from urlparse import urljoin

from django.contrib.auth.tokens import default_token_generator
from django.utils.http import int_to_base36
from django.contrib.sites.models import Site
from django.core.urlresolvers import reverse

from emailtools import MarkdownEmail


class BuildAbsoluteURIMixin(object):
    use_https = False

    def get_site(self):
        return Site.objects.get_current()

    def reverse_absolute_uri(self, view_name, args=None, kwargs=None):
        location = reverse(view_name, args=args, kwargs=kwargs)
        return self.build_absolute_uri(location)

    def build_absolute_uri(self, location):
        current_site = self.get_site()
        current_uri = '{protocol}://{domain}{location}'.format(
            protocol=('https' if self.use_https else 'http'),
            domain=current_site.domain,
            location=location,
        )
        return urljoin(current_uri, location)


class UserTokenEmailMixin(BuildAbsoluteURIMixin):
    UID_KWARG = 'uidb36'
    TOKEN_KWARG = 'token'

    token_generator = default_token_generator

    def get_user(self):
        return self.args[0]

    def generate_token(self, user):
        return self.token_generator.make_token(user)

    def get_uid(self, user):
        return int_to_base36(user.pk)

    def reverse_token_url(self, view_name, args=None, kwargs=None):
        kwargs.setdefault(self.UID_KWARG, self.get_uid(self.get_user()))
        kwargs.setdefault(self.TOKEN_KWARG, self.generate_token(self.get_user()))
        return self.reverse_absolute_uri(view_name, args=args, kwargs=kwargs)


class PasswordResetEmail(UserTokenEmailMixin, MarkdownEmail):
    from_email = 'webserver@retulfit.com'
    template_name = 'accounts/mail/password_reset.html'
    subject = "Retul: Password Reset"
    use_https = True

    def get_to(self):
        return [self.get_user().email]

    def get_context_data(self, **kwargs):
        kwargs = super(PasswordResetEmail, self).get_context_data()
        user = self.get_user()
        kwargs.update({
            'user': user,
            'reset_url': self.reverse_token_url('accounts.views.password_reset_confirm'),
        })
        return kwargs

password_reset_email = PasswordResetEmail.as_callable()