The ISN has a feature within Office Settings that allows for you determine whom the email is from when emailing the invoice associated to an order.
Navigate to: Settings--> Office Settings--> Interacting with my Clients and Agents--> Invoice Settings:
Clicking on Invoice Settings will bring you the following screen. From there click on the setting to override whom the email will be coming from:
Scroll down and click on Save Settings when done!
If you have any questions about this process please let us know! You can reach us by chat, email at email@example.com, or phone at (800) 700-8112.