Other software that sends emails on behalf of a sender usually provide information about the status of an email once it is sent. I need to know whether the email was 'undeliverable', 'unopened', 'opened', or 'replied'. Since there is no place for notes without an add-on and we do not have this information, it is difficult to prove the customer received the invoice.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.