Simple way to delivery email


I’d like to know how is the best way to delivery sales quotation or invoices to customers.

For example, I would like to have and option Send email after confirm that send the document to the party email. The could be configurable for sales and invoices (I’m sure it could be used in other documents).

Email could be configured in CONF file (like web_user module).

I don’t know if it is already configurable in tryton,

Any help will be welcome.

This already exists with notification_email module.