Hi there, BurakY.

It's good that your customers are receiving their invoices correctly. On the other hand, undelivered and bounced emails are still part of the investigation.

Looks like not being able to receive a copy of the invoice is new. You can contact our QuickBooks Live Team and report this issue. That way, they can include it to the current investigation.

Please know that our Product Team is currently implementing measures to fix the issue. If other customers aren't getting an email, you can perform the workaround I've outlined below.

• Save invoices as a PDF and send them via email through your business or other email address.
• Send a customer the link to their invoice through SMS or messenger service. Simply click Save and share link, then select Copy link, and paste it to your SMS.
• Save the invoice as a PDF, print it, and send their invoice via email.

Once your customers pay what they owe, you can record the payment in QuickBooks. Check out this article as your guide: Learn how to receive and record invoice payments in QuickBooks Online.

Let me know if you have additional questions by commenting below. I'll be right here to answer your concerns.