A better separation of invoice email and organisational email would be a very good implementation especially when you sync these to mailchimp.
Often a client has it fully automated and currently it is not possible to easily exclude these from mailchimp sync. This results into a barrage of autoreplies often not traceable to an account.
An “invoice email” category and an option to exclude these from mailchimp sync would be helpful in taking away this nuissance and flagging automated/invoice only e-mail addresses.
When it is not flled in the invoice emails could default back to the organisation email and/or receives invoices tag.