Automatic emailing of invoices?

I see invoices are automatically generated, but I am not seeing them emailed out., nor a means to have them emailed automatically, nor manually.

Is invoice generating for post paid?

And is it automatic?

Looking at the test accounts I made, it appears there are invoices generated automatically for both prepaid and post paid.

However, they are not being emailed out. Only some notifications about account balance and package renewal.