A possible approach could be to add multiple Org-Wide addresses to Salesforce, and then have multiple email delivery options available at runtime for each.
We don't have any current plan to add this as a choice for the user running the package, however we will monitor this idea for votes.
Thanks for this suggestion,
Today, you can use Organization-wide email addresses in our Email delivery option.
You can add these in Salesforce Setup, and use them in your Document package configuration.
https://help.salesforce.com/s/articleView?id=sf.emailadmin_manage_orgwide_email_addresses.htm&type=5
A possible approach could be to add multiple Org-Wide addresses to Salesforce, and then have multiple email delivery options available at runtime for each.
We don't have any current plan to add this as a choice for the user running the package, however we will monitor this idea for votes.