Hi everyone. I value every step you've taken to isolate the Delivery Server Down error while sending your invoices in QuickBooks Online (QBO). Let me share some updates about this issue.

I want you to know that this has been a priority of our engineering team, and they're currently working on a resolution as quickly as possible. While the investigation is in progress, I recommend sending your invoices manually outside of QuickBooks.

Here's how:

1. Open your transaction.
2. Click on Print or Preview.
3. Tap on Download, then save the file.
4. Attach the file to your email, then send it to your customer manually.
5. Repeat the same steps for other invoices.

You can also visit this link for updates: https://status.quickbooks.intuit.com/.

For more hints while working with your invoices in our system, you can also review the resources from these links:

• Create invoices in QuickBooks Online
• Add, organize, and send invoices

Drop me a reply in the comment section below if you have follow-up questions while working with your invoices and other entries in QBO. I'm just a few clicks away to help. Have a good one!