Confirmation email is being sent every 5 minutes

[Szilvia]

I added several of my old clients to the system under "Clients."
For those whose subscription was still active, I issued an invoice in the system (2 clients). When I recorded a payment for one of them, I noticed that the system had generated a new invoice (even though I thought it would only generate a new one automatically a year later, after the client was added and the initial invoice was created).

I checked the email log for the client and saw that the system was continuously sending emails every 5 minutes related to the invoice it generated. After recording the payment, it started sending the payment confirmation email every 5 minutes as well.

I checked this with another client too: after I deleted the system-generated invoice, the emails stopped. However, with the first client, since I marked the system-generated invoice as paid, I can no longer delete it—and the emails are still being sent continuously.

My questions:

• How can I stop the continuous email sending? I even disabled the payment notifications for this client, but the emails are still being sent.

• Where can I see the status of these emails? Are they actually being delivered? I assume not, because the invoice status shows "Unsent", which I guess is why the system keeps trying.

• Is it possible to set a maximum number of delivery attempts (e.g., 3 times), and then have the system stop if the emails still fail to send?