All of your normal transactional emails that would go to a customer (through Shopify email) will be sent from the retailer, regardless of whether it is a supplier or retailer product getting fulfilled.
For example, order confirmation, shipping confirmation, and order refunds will all come from the retailer's Shopify email.
Below is an example of a retailer confirmation email for a supplier's product:
NOTE: If it's a mixed cart, the customer may receive multiple notifications sent from the retailer with shipping information.
NOTE: Some suppliers send order confirmation/marketing emails using Klaviyo or other 3rd party apps. Right now, there's no way for Carro to block those emails from the supplier, as it's through a 3rd party app.