Hi IT_Guy69,

Have you tried the steps shared by my colleagues above? You can let your customers check the invoices on their Spam or Junk folder.

If it's not there, I recommend reaching out to our Techincal Support team. We have designated agents that can check your account and investigate what's causing the issue.

Here's how you can reach out to them:

1. From the ? Help button, click Contact Us.
2. Enter, This E-mail came from e.notification.intuit.com and is listed in BADWHOIS.
3. Click Let's talk.
4. From there select either Get a callback,  Schedule a call, or Start a chat.

Feel free to tag my name if you need help. Stay safe!