docker-compose run web django-admin.py startproject puremail .
 docker-compose up

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'postgres',
        'USER': 'postgres',
        'HOST': 'db',
        'PORT': 5432,
    }
}

docker-compose down
docker-compose run web python manage.py makemigrations
docker-compose run web python manage.py migrate
docker-compose up

 docker-compose run web python manage.py sqlmigrate polls 0001

docker-compose run web python manage.py dumpdata --format=json --indent=4 -o students/fixtures/001.json

docker-compose run web python manage.py loaddata students/fixtures/001.json

docker-compose stop
docker-compose run web python manage.py createsuperuser
docker-compose start

python3 -m smtpd -n -c DebuggingServer localhost:1025

from django.core.mail import send_mail

send_mail('Subject here', 'Here is the message.', '[email protected]', ['[email protected]'], fail_silently=False)

EMAIL_HOST = 'smtp.sendgrid.net'
EMAIL_HOST_USER = 'xxxxxxxx'
EMAIL_HOST_PASSWORD = 'xxxxxxxx'
EMAIL_MAIN = '[email protected]'
EMAIL_PORT = 587
EMAIL_USE_TLS = True

EMAIL_BACKEND = "sendgrid_backend.SendgridBackend"
SENDGRID_API_KEY = "xxx"
#os.environ["SENDGRID_API_KEY"]