Subscribe by email from address in multisite install

I am after a bit of clarification on how the Subscribe by Email plugin functions for a multisite install. I am hoping you can tell me how the Notification from Email setting works. Is this one email address for all of the sites in my multisite install? Or is it possible to have an individual from address for each subsite?

For example I'd like to be able to set the from address for to an address like and the address for to an address like

Is this possible? Or do I instead have one address for every subsite?

Thanks in advance for any clarification you're able to provide.