Hi,

Odoo doesn’t have a built-in field for “default email per document type,” but you can achieve it in a clean way without making the contact a global follower:

When you create a contact under the Customer (Contacts ➝ Add Contact), you can set the Type as:

    Invoice Address – will be used for invoices

    Delivery Address – will be used for deliveries

If you store the delivery person’s email in the “Delivery Address” contact, Odoo will automatically use it when generating delivery orders, while the invoice emails still go to the Invoice Address. This is the simplest and most standard way.

Hope it helps