Hi crystallady74,

I appreciate the initial steps you did.  Let's check to see why you can't send your invoices.

There could be a temporary issue with your recipient's email server, or it's blocking Intuit. You can let them check their settings and add *.intuit.com and *.intuit.net as trusted sites.

If the issue persists, please contact our QBO Support to investigate this further. They have more tools on their end.

On the other hand, you can check out the self-help articles for QBO should you need them in the future.

Let me know if you have any other concerns. Take care and have a good one!