How to fix the delivery error when sending invoice?

Hi there. I've got you covered and let's work this out together so you can send your invoice in QuickBooks Online (QBO) without getting an error.

Before doing so, can you tell me the exact error message you're getting? This way, I could provide you with an accurate resolution to get rid of the error.

In the meantime, let's do some troubleshooting steps to rectify this. First, make sure your company email and all customer-facing email fields are complete, have the correct format, and don't have prefixes. To do so, follow these steps:
 

1. Go to Settings ⚙.
2. Select Account and settings, then Company.
3. Select Contact info, then check your Company email and Customer-facing email. Use these examples as a reference on what format to use:
   • Correct: mycompany@mycompany.com
   • Incorrect: email:mycompany@mycompany.com

If you use location tracking, check the email address format of the location you used on the sales form. Here's how:
 

1. Go to Settings ⚙.
2. Select All lists, then Locations.
3. Find the location you used on the invoice.
4. In the Action column, select the dropdown, then Edit.
5. Check your email address in the field “This location has a different email address for communicating with customers” and make changes if needed.
6. Select Save.
7. Try to resend your sales form.

Aside from that, check your invoice format and make sure it doesn’t have special characters on the Description, Attachment name, Message, Email address, or Custom form templates. To learn more about the detailed process, see this link: Fix the Delivery Server Down error in QuickBooks Online.

If the same thing happens even after performing these steps, I suggest downloading the invoice in a PDF file and sending it out manually via your email provider. This way, you'll be able to send invoices in real-time.

If you have other QuickBooks concerns, don't hesitate to leave a reply. We're always around to help.