I appreciate you joining the conversation and sharing your experience about the issue, @MarioH.

Have you tried performing some troubleshooting steps to rectify the error? If not, I can give you some tips on what to do when you're unable to send emails.

Step 1: Edit your admin privileges  

Step 2: Edit your email preferences in QuickBooks 

Step 3: Check your Internet Explorer email preferences   

Step 4: Repair your MAPI32.dll   

Step 5: Install QuickBooks again

Here's an article that details the process: How to fix "Error: QuickBooks is unable to send your email to Outlook"

However, if you're done doing these steps, I recommend reaching out to our QuickBooks Support team. Our phone agents can further investigate this issue.

Here's how to get in touch with us:
 

1. Open QuickBooks.
2. Go to Help, then select QuickBooks Desktop Help/Contact Us.
3. Select Contact Us.
4. Give a brief description of your issue, then select Continue.
5. Select to chat with us or Have us call you.

Please consider checking our available hours so we can address your concern on time.

In the meantime, you can check this article for additional information about managing your QuickBooks account: Help articles.

The Community is always around to assist if you have further questions. We'd be glad to help. Keep safe.