Welcome to the Community - thank you for your question!
Could you please make sure your customers have *@intuit.com added to their safe senders list on their email server? It may be that our emails are being blocked by their server, so we would like to confirm this by trying this step. Once they have done this, resend the invoices/estimates and let us know if they receive them.
It's possible that the estimates and invoice were routed to the junk mail and spam folders. You can let your customer check their junk mail and spam folders.
Alternately, we can also try logging into your account through a different browser. From there, we can try sending the invoice again to see if the status changes accordingly.
If you don't experience any issue when using another one, we can switch back to your regular browser and clear its cache. This process will improve the speed and overall browsing experience when using QBO account.
If the problem persists, I'd suggest contacting our Customer Care Team. One of our support will need to check your account and perform additional troubleshooting to determine the cause of the issue.
Feel free to leave your comments below if you have other questions. I'm always here to help.
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