add email config through env vars

oser_backend/oser_backend/settings/common.py

@@ -191,6 +191,13 @@ AUTH_PASSWORD_VALIDATORS = [
     },
 ]
 
+# Email configuration
+EMAIL_HOST = os.environ.get('EMAIL_HOST')
+EMAIL_PORT = os.environ.get('EMAIL_PORT', 587)
+EMAIL_HOST_USER = os.environ.get('EMAIL_HOST_USER')
+EMAIL_HOST_PASSWORD = os.environ.get('EMAIL_HOST_PASSWORD')
+EMAIL_USE_TLS = os.environ.get('EMAIL_USE_TLS', True)
+
 # Internationalization
 # https://docs.djangoproject.com/en/2.0/topics/i18n/