Hi Keith,
You can set the "sender" address in a couple of different spots, depending on your needs.
-
Ecommerce / Store Configuration / Emails / Send e-commerce emails from
This setting will set it for the Store level. This would cause e-commerce to be "From" the entered address.
-
Ecommerce / Multistore Configuration / Store Settings / Emails / Send e-commerce emails from
This setting will set the address for all sites ( in the event you are hosting multiple sites in the same installation).
-
Settings / E-commerce / Send e-commerce emails from
This setting will set the address on a global level, giving each site a value to inherit from.
Depending on how you need to configure you site, you should be able to leverage one of those settings.