I use the same email to send invoices. Sometimes they go out or are sent, and sometimes they are undeliverable. This causes problems.

Thank you for letting us know, damonkirch.

I understand the importance of delivering invoices on time. I reviewed our system and discovered that there is an issue with undelivered invoices.

Our engineers are investigating the issue to find a long-term solution so that you can continue sending invoices. In the meantime, I suggest contacting our Support Team to ensure that your company will receive updates and are added to the list of users that are affected. 

Here's how:

1. Log in to your QuickBooks Online company.
2. Go to Help (?).
3. Select Search tab, then click on Contact Us.
4. Enter a brief discussion of your concern and click Continue.
5. Choose a way to connect with us:

• Start a chat with a live support.
• Get a callback from the next available support.

You can check out this link for more information in contacting our support: QuickBooks Online Support.

Thank you so much for extending your patience. Have a wonderful day!

Thanks for the information, I will try to figure it out for more. Keep sharing such informative post keep suggesting such post.