Django Send_mail not working in production - django

Question

I have the current set up and emails are pushed locally fine but it doens't in production. It is a django, docker, dokku and nginx setup hosted on a VPS.
Locally I run it in docker with docker compose up and in production also with the same dockerfile. This is all the info that i thought was useful does anyone know what i have to do?
settings.py
...
EMAIL_BACKEND = "django.core.mail.backends.smtp.EmailBackend"
EMAIL_USE_TLS = True
EMAIL_HOST_USER = os.environ.get("Email_Username", "")
EMAIL_HOST_PASSWORD = os.environ.get("Email_Password", "")
EMAIL_HOST = os.environ.get("Email_Host", "mail.domain.nl")
EMAIL_PORT = os.environ.get("Email_Port", 587)
...
actions.py
def sendRegisterMail(modeladmin, request, queryset):
for lid in queryset:
print("email sending")
achievements = '...'
subject = "..."
message = f""" ... """
send_mail(
subject,
message,
settings.EMAIL_HOST_USER,
[lid.email],
fail_silently=True,
)
print("email sent")
dokku nginx:show-config app
server {
listen [::]:80;
listen 80;
server_name app.dispuutstropdas.nl;
access_log /var/log/nginx/app-access.log;
error_log /var/log/nginx/app-error.log;
include /home/dokku/app/nginx.conf.d/*.conf;
location / {
return 301 https://$host:443$request_uri;
}
}
server {
listen [::]:443 ssl http2;
listen 443 ssl http2;
server_name app.dispuutstropdas.nl;
access_log /var/log/nginx/app-access.log;
error_log /var/log/nginx/app-error.log;
ssl_certificate /home/dokku/app/tls/server.crt;
ssl_certificate_key /home/dokku/app/tls/server.key;
ssl_protocols TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers off;
keepalive_timeout 70;
location / {
gzip on;
gzip_min_length 1100;
gzip_buffers 4 32k;
gzip_types text/css text/javascript text/xml text/plain text/x-component application/javascript application/x-javascript application/json application/xml application/rss+xml font/truetype application/x-font-ttf font/opentype application/vnd.ms-fontobject image/svg+xml;
gzip_vary on;
gzip_comp_level 6;
proxy_pass http://app-8000;
http2_push_preload on;
proxy_http_version 1.1;
proxy_read_timeout 60s;
proxy_buffer_size 4096;
proxy_buffering on;
proxy_buffers 8 4096;
proxy_busy_buffers_size 8192;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $http_connection;
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Port $server_port;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Request-Start $msec;
}
error_page 400 401 402 403 405 406 407 408 409 410 411 412 413 414 415 416 417 418 420 422 423 424 426 428 429 431 444 449 450 451 /400-error.html;
location /400-error.html {
root /var/lib/dokku/data/nginx-vhosts/dokku-errors;
internal;
}
error_page 404 /404-error.html;
location /404-error.html {
root /var/lib/dokku/data/nginx-vhosts/dokku-errors;
internal;
}
error_page 500 501 503 504 505 506 507 508 509 510 511 /500-error.html;
location /500-error.html {
root /var/lib/dokku/data/nginx-vhosts/dokku-errors;
internal;
}
error_page 502 /502-error.html;
location /502-error.html {
root /var/lib/dokku/data/nginx-vhosts/dokku-errors;
internal;
}
include /home/dokku/app/nginx.conf.d/*.conf;
}
upstream app-8000 {
server 172.17.0.7:8000;
}
ports in dokku
DOKKU_PROXY_PORT_MAP: http:80:8000 https:443:8000
Dockerfile (which works)
FROM python:3.10.7-alpine
COPY backend/requirements.txt ./
RUN apk update \
&& apk add postgresql-dev gcc python3-dev musl-dev \
&& apk add -u zlib-dev jpeg-dev gcc musl-dev \
&& pip install -r requirements.txt
RUN mkdir /code
WORKDIR /code
ADD . /code/
ENV PYTHONUNBUFFERED 1
EXPOSE 8000
CMD gunicorn core.wsgi:application --chdir backend -b 0.0.0.0:8000 --log-file -
Thanks for your help in advance