I see how this issue becomes challenging for you, @Sauwee. 

You can count on me to help you fix this. There are several reasons why you're QuickBooks isn't responding when sending an email and the same goes for error 3371 which you couldn't initialize license properties.

Most of the time, if you use WebConnect with QuickBooks Enterprise or Right Networks, you'll see this error if you open the file before you save it. You must first save the file before you import the QBO file.

With this in mind, installing the QuickBooks Tool Hub is the initial step in fixing common errors like this. Remember to close your QuickBooks whenever you use the tool hun and we recommend using the Tool Hub on Qindows q0, 64-bit.

Here's how: 

1. Close QuickBooks.
2. Download the most recent version (1.6.0.3) of the QuickBooks Tool Hub. Save the file somewhere you can easily find it (like your Downloads folder or your Windows desktop). Note: If you've installed Tool Hub before, you can find out which version you have. Select the Home tab. The version will be on the bottom.
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. When the installation finishes, double-click the icon on your Windows desktop to open the tool hub.

Note: If you can't find the icon, do a search in Windows for QuickBooks Tool Hub and select the program.

From there, we'll need to run the 3371 Error fix. By going to QuickBooks Tool Hub.

1. Select Installation Issues.
2. Choose 3371 Error Fix.
3. Click OK.
4. Begin with QuickBooks Desktop and open your data file.

Another way around this is to reinstall QuickBooks Desktop. After reinstalling, if the same error persists, then we'll need to work with a qualified IT professional or contact Microsoft. 

There might be damage to your Windows Operating System.

For future use, if you need to install or move QBDT to another computer, we'll show you you can do it by reading this article: Move or reinstall QuickBooks Desktop to another computer.

I'll always be here if you need additional help in managing your QBDT account. Take care.