Your hosting provider might have set up the host and any possible login credentials for all the PHP pages on their machines. This would make it seem like none are required. Your hosting provider should be more than happy to give you the information. Try searching for SMTP in their FAQ, forum, and any welcome emails they sent. If your search does not turn anything up, ask them directly.
Once you have the information, you will want to add it to your settings.py file using these email settings:
# *** settings.py ***
#EMAIL_HOST = 'host here'
#EMAIL_PORT = 587
#EMAIL_HOST_USER = 'your user here'
#EMAIL_HOST_PASSWORD = 'your password'
#EMAIL_USE_TLS = True
Uncomment and use as many of these settings as you need.