Send email notifications about my invoice status updates

I feel that when I send a proposal or an invoice, I should get an email that confirms that I sent the invoice.

Then there should be another email that alert that the person opened the invoice.

Then there could be a third email generated that says that the job was either accepted or denied.

That way you know what's happening throughout the process because I kept checking and checking and checking in and it just there was a little bit of miscommunication that happened between me and him.

I think that would be pretty cool.