smtplib.SMTPNotSupportedError: SMTP AUTH extension not supported by server - trying to send email via Django

Question

I have a Docker container where I am trying to send an email via Django.

I have a separate email server on another domain that I want to use for this purpose. I have other applications connect with it with no problem.

My Django production email setup looks like this (I intend to replace username and password with Kubernetes secrets in the future, but for testing I am just putting them inside the file):

EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'mail.mydomain.io'
EMAIL_USE_TLS = True
EMAIL_PORT = 587
EMAIL_HOST_USER = "<username>"
EMAIL_HOST_PASSWORD = "<password>"

In my module, I have the following code:

from rest_framework.views import APIView
from django.core.mail import send_mail

class MailView(APIView):

    def post(self, request):

        subject = request.data.get("subject")
        message = request.data.get("message")
        sender = request.data.get("sender")
        receipients = request.data.get("receipients")

        send_mail(subject,message,sender,receipients,fail_silently=False,)
        ... more

This works locally, however when I try to run it inside the container, I get the following error:

smtplib.SMTPNotSupportedError: SMTP AUTH extension not supported by server.

Do I need to install some sort of SMTP relay or server to my Docker container?

My Docker container is based on the python:3.7 container and I am not currently installing any SMTP extensions or anything to it.

Answer 1

EMAIL_USE_TLS needs to be set to True

EMAIL_USE_TLS = True