Configure SMTP settings network wide?

e-Newsletter looks like it would be a great tool for our multisite network to allow admins to communicate with their members. I've network activated it, and the e-Newsletter item within the dashboard contains the SMTP server I'd like to use globally (Mailgun).

In the wp-admin of my main domain, the same SMTP settings are present. But if I log into any other site, I have empty settings - isn't that defeating the purpose of having it network activated? Or is the plugin not designed for multisite?