[FIXED] SMTPServerDisconnected at /auth/users/

Issue

I am currently working with Python 3.10.1 and Django 4.0.1 on the back end, and React/Redux on the front end. I have an app where after a user signs up, an activation email will be sent. However, the email never shows up and while visiting the backend, I see this error inside the network tab in devtools.

I switched from gmail due to the work arounds that ended up not working for me so I went with SendGrid, but haven't gotten that to work yet either.

From all of the posts I have seen so far, this looks right.

settings.py

EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'smtp.sendgrid.net'
EMAIL_HOST_USER = 'api'
EMAIL_HOST_PASSWORD = 'password'
DEFAULT_FROM_EMAIL = '[email protected]'
EMAIL_PORT = 587
EMAIL_USE_TLS = True

auth.js

// sign up function
export const signup = (email, password, re_password) => async (dispatch) => {
    const config = {
        headers: {
            'Content-Type': 'application/json',
            'X-CSRFToken': csrftoken,
        },
    };
    const body = JSON.stringify({ email, password, re_password });
    try {
        const response = await axios.post(
            `${process.env.REACT_APP_API_URL}/auth/users/`,
            body,
            config
        );
        dispatch({
            type: SIGNUP_SUCCESS,
            payload: response.data,
        });
    } catch (err) {
        dispatch({
            type: SIGNUP_FAIL,
        });
    }
};

Traceback (if it helps)

Environment:


Request Method: POST
Request URL: https://total-weather-backend.herokuapp.com/auth/users/

Django Version: 4.0.1
Python Version: 3.10.1
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'api',
 'rest_framework',
 'djoser']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'whitenoise.middleware.WhiteNoiseMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'corsheaders.middleware.CorsMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback (most recent call last):
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/app/.heroku/python/lib/python3.10/site-packages/rest_framework/viewsets.py", line 125, in view
    return self.dispatch(request, *args, **kwargs)
  File "/app/.heroku/python/lib/python3.10/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "/app/.heroku/python/lib/python3.10/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/app/.heroku/python/lib/python3.10/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/app/.heroku/python/lib/python3.10/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
  File "/app/.heroku/python/lib/python3.10/site-packages/rest_framework/mixins.py", line 19, in create
    self.perform_create(serializer)
  File "/app/.heroku/python/lib/python3.10/site-packages/djoser/views.py", line 144, in perform_create
    settings.EMAIL.activation(self.request, context).send(to)
  File "/app/.heroku/python/lib/python3.10/site-packages/templated_mail/mail.py", line 78, in send
    super(BaseEmailMessage, self).send(*args, **kwargs)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/mail/message.py", line 284, in send
    return self.get_connection(fail_silently).send_messages([self])
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/mail/backends/smtp.py", line 102, in send_messages
    new_conn_created = self.open()
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/mail/backends/smtp.py", line 69, in open
    self.connection.login(self.username, self.password)
  File "/app/.heroku/python/lib/python3.10/smtplib.py", line 739, in login
    (code, resp) = self.auth(
  File "/app/.heroku/python/lib/python3.10/smtplib.py", line 642, in auth
    (code, resp) = self.docmd("AUTH", mechanism + " " + response)
  File "/app/.heroku/python/lib/python3.10/smtplib.py", line 432, in docmd
    return self.getreply()
  File "/app/.heroku/python/lib/python3.10/smtplib.py", line 405, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")

Exception Type: SMTPServerDisconnected at /auth/users/
Exception Value: Connection unexpectedly closed

Solution

The username should be apikey, not api. From the docs:

To use your API key with the SMTP integration, you must set your username to the string, apikey. Your password will be the API key you generated in the previous step.

Answered By - Selcuk