All Hoopla Hosting webservers run a local SMTP server.
To set the SMTP server on Zurmo you will need to navigate to "Email Configuration"
Click the cog on the top right, Settings, Email Configuration (settings), Email SMTP Configuration
Set the Host to 127.0.0.1 and leave the port as the default 25
If you want emails to appear from email@example.com then you will need to create an email address in cPanel and use the crediantals in Zurmo.