I am still getting bounce back email after they customer clearly got the email. I even sent myself email and its showing error after I clearly got the email.

It can be challenging, charles. I understand the importance of being notified accurately. 

To proceed, may I ask for the specifics of the error you encountered? More information about this will help me come up with accurate resolutions. 

In the meantime, we can perform some troubleshooting steps to rule out the possibility of a browser issue. Since you mentioned your customers have received the email, yet it still has an undelivered status. In that account, we can open your QuickBooks Online (QBO) account on an incognito window. Doing so prevents the browser history from being saved. 

Refer to the following keyboard shortcuts based on your browser type: 

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

If the private browsing session works, clear the browser's cache so the system can restart. This task is also possible in other supported, up-to-date browsers. Clearing the cache will reboot the system, allowing you to work with a clean slate. 

However, if you meant the Undelivered error showing on your end after sending your invoices to your customers, please note that we have an in-progress investigation about this delivery issue. In this case, I recommend contacting the Customer Support Team. This way, you'll be listed as one of the affected users and will be notified about the course of this investigation.  

Furthermore, check out these resources to help you with handling your invoices in QBO: 

• Customize invoices, estimates, and sales receipts in QuickBooks Online
• Record invoice payments in QuickBooks Online
• Add a discount to an invoice or sales receipt in QuickBooks Online

Keep me posted if you have additional concerns about managing your display features in QBO. I'll get back to you as soon as I can. Keep safe! 

cleared the cache  did all the above... still shows error. 

did all of the above... still showing error.   My clients are saying they received the email from me.  Its just annoying to see that red delivery issue    please let me know of any other options? 

I appreciate the steps you've taken so far to resolve this issue, comer.  

Using the information you've provided, I was able to check our system for this error. It turns out that there's an ongoing investigation regarding an undelivered error on an invoice named INV-101129. Therefore, to ensure your concern reaches the relevant team, I recommend reaching out to our online support. This way, they can add you as one of the affected users using their tools. It's also best to mention the investigation number for them to search for it in their system. 

Here's how: 

1. In your QBO account, select Help (?). 
2. Choose the Search tab.
3. At the bottom of your screen, click Contact Us.  
4. Type your concern. Then click Continue. 
5. You may choose Callback, Appointment, or Chat, as your way to connect with us. 
6. Kindly fill out the provided fields, such as your First name, Last name, Email address, and Phone number. 
7. Depending on what you choose as your way to connect with us, click Callback, Schedule an appointment, or Chat. 

You may also want to learn more about the Support hours of QuickBooks.

Additionally, after a customer pays the invoice, you can now record it as a received payment so that it will balance your accounts. 

Keep me posted as you contact our support. I'm still here if you have other questions about invoices. Rest assured that I'll be here to help in any way possible.