Django AllAuth - How to manually send a reset-password email?

It's possible. My solution implements a User model post_save signal to call the Allauth Password reset view which will send the user the email. The first thing to consider is to make the user email address mandatory in the admin user create form (as explained here). And then use this code:

from allauth.account.views import PasswordResetView

from django.conf import settings
from django.dispatch import receiver
from django.http import HttpRequest
from django.middleware.csrf import get_token


@receiver(models.signals.post_save, sender=settings.AUTH_USER_MODEL)
def send_reset_password_email(sender, instance, created, **kwargs):

    if created:

        # First create a post request to pass to the view
        request = HttpRequest()
        request.method = 'POST'

        # add the absolute url to be be included in email
        if settings.DEBUG:
            request.META['HTTP_HOST'] = '127.0.0.1:8000'
        else:
            request.META['HTTP_HOST'] = 'www.mysite.com'

        # pass the post form data
        request.POST = {
            'email': instance.email,
            'csrfmiddlewaretoken': get_token(HttpRequest())
        }
        PasswordResetView.as_view()(request)  # email will be sent!