Django: sending email causes OSError - django

Question

I'm setting up registration proces for my Django REST API. I use "email.send()" function in my SignUpView. When I create new user, it should send him activation link. Unfortunately i get "OSError: [Errno 99] Cannot assign requested address".
I was looking for some solutions, but all was conected to some problems with sockets. Despite this I tried to change my ports in settings.
My email settings in settings.py:
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_USE_TLS = True
EMAIL_HOST = 'smtp.gmail.com'
EMAIL_HOST_USER = 'myemail#gmail.com'
EMAIL_HOST_PASSWORD= 'mypassword'
EMAIL_PORT = 587
View i used to signup:
class SignUp(APIView):
def post(self, request, format=None):
serializer = SignUpSerializer(data=request.data)
if serializer.is_valid():
user = serializer.save(is_active=False)
current_site = get_current_site(request)
mail_subject = 'Aktywuj swoje konto w serwisie Podwoozka.'
message = 'user: ', user.username,'domain', current_site.domain,'uid',urlsafe_base64_encode(force_bytes(user.pk)).decode(),'token', account_activation_token.make_token(user),
to_email = user.email
email = EmailMessage(
mail_subject, message, to=[to_email]
)
email.send()
return HttpResponse('Potwierdz email aby zakonczyc rejestracje.')
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
And finally entire Traceback when i use this function:
Traceback (most recent call last):
api_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
api_1 | response = get_response(request)
api_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 126, in _get_response
api_1 | response = self.process_exception_by_middleware(e, request)
api_1 | File "/usr/local/lib/python3.7/site-packages/django/core/handlers/base.py", line 124, in _get_response
api_1 | response = wrapped_callback(request, *callback_args, **callback_kwargs)
api_1 | File "/usr/local/lib/python3.7/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
api_1 | return view_func(*args, **kwargs)
api_1 | File "/usr/local/lib/python3.7/site-packages/django/views/generic/base.py", line 68, in view
api_1 | return self.dispatch(request, *args, **kwargs)
api_1 | File "/usr/local/lib/python3.7/site-packages/rest_framework/views.py", line 495, in dispatch
api_1 | response = self.handle_exception(exc)
api_1 | File "/usr/local/lib/python3.7/site-packages/rest_framework/views.py", line 455, in handle_exception
api_1 | self.raise_uncaught_exception(exc)
api_1 | File "/usr/local/lib/python3.7/site-packages/rest_framework/views.py", line 492, in dispatch
api_1 | response = handler(request, *args, **kwargs)
api_1 | File "/Dback/races/views.py", line 264, in post
api_1 | email.send()
api_1 | File "/usr/local/lib/python3.7/site-packages/django/core/mail/message.py", line 291, in send
api_1 | return self.get_connection(fail_silently).send_messages([self])
api_1 | File "/usr/local/lib/python3.7/site-packages/django/core/mail/backends/smtp.py", line 103, in send_messages
api_1 | new_conn_created = self.open()
api_1 | File "/usr/local/lib/python3.7/site-packages/django/core/mail/backends/smtp.py", line 63, in open
api_1 | self.connection = self.connection_class(self.host, self.port, **connection_params)
api_1 | File "/usr/local/lib/python3.7/smtplib.py", line 251, in __init__
api_1 | (code, msg) = self.connect(host, port)
api_1 | File "/usr/local/lib/python3.7/smtplib.py", line 336, in connect
api_1 | self.sock = self._get_socket(host, port, self.timeout)
api_1 | File "/usr/local/lib/python3.7/smtplib.py", line 307, in _get_socket
api_1 | self.source_address)
api_1 | File "/usr/local/lib/python3.7/socket.py", line 727, in create_connection
api_1 | raise err
api_1 | File "/usr/local/lib/python3.7/socket.py", line 716, in create_connection
api_1 | sock.connect(sa)
api_1 | OSError: [Errno 99] Cannot assign requested address
I don't know if its important, but im using docker in this project. I heard sometimes there are some problems with outgoing connections from container.
EDIT: I tried to run it in pipenv instead of docker, still not working.
This time its "ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it"

Answer 1

First, make sure that you enabled POP access in Gmail:
https://support.google.com/mail/answer/7104828?hl=en&visit_id=637244831918669326-2427073497&rd=1
Then, if you receive Application-specific password required error, set up an app password for your account:
https://support.google.com/accounts/answer/185833?p=InvalidSecondFactor&visit_id=637244831918669326-2427073497&rd=1

Answer 2

In my case, this problem has been resolved with set SMTP_BLCOK = off.
in ssh or terminal
You must run the 3 commands in your ssh or terminal:
vi /etc/csf/csf.conf
SMTP_BLOCK = "0"
csf -r
in cpanel
You must follow this path:
WHM >‌ Plugins > ConfigServer Security & Firewall > Firewall Configuration > SMTP_BLCOK
and set SMTP_BLCOK = OFF